2015 Chevrolet Express 3500, Viper Security

I am interested in installing a viper proximity alarm system in my chevy and it requires a starter kill switch relay when engaging the alarm. So Im looking for the best location to access directly the starter signal wire to install that relay switch, preferably close to the passenger side where the BCM is located. I see theres a couple of points on the BCM for Ignition.
2 PK Off/Run/Crank Ignition Voltage
4 WH Off/Run/Crank Ignition Voltage
14 PK Run/Crank Ignition 1 Voltage
And theoretically pins 2 - 4 are the "secondary starter
Second Starter pink (r-code), white (5V ref) (Tech Doc 1605) +9600 ohms ignition switch or BCM under pass dash, green plug, pins 2, 4" from some guys post on here regarding a 2016 on this subject, which i might add has been incredibly informative. I just would prefer a more direct connection without potential interference from other connections delivering power to the starter for this.
My question,
Is this counter intuitive? Trying to install an additional security system along side the GM standard passkey 3? Will it interfere with any stock anti theift system installed already?
Does that starter signal wire that connects to the underhood fuse box, 56 pin plug, pin E1, run through somewhere close the the BCM?
Anyone who has done this install before willing to offer some advice?

Eliminate the starter kill from the equation, your PK3 is sufficient.

Thank you for the suggestion, and I am considering it.

My van also came with RKE, so I am thinking this whole viper install might just be redundant, but I would prefer the viper as I am more comfortable with its system. The proximity alarm and theoretical comfort closure using aux1 sounds ideal.

Currently, I'm under the impression there is no real alarm system installed to alert me of potential theift or vandalism.

I value outside opinions, especially from experienced technicians, and Im open to your advice. Really, any information regarding the PK3 system or Viper security install is appreciated.

Ive wrapped my head around the wires and where they should go, even the starter (as long as it won't interfere with the PK3) but Im unsure of the best Instant trigger input wire, I've read hood pin or dome light but the dome light may cause an instant trigger on exit.

Also, does anyone know if connecting (-) 200mA TRUNK / AUX 1 OUTPUT (Channel 2)
Or
(-) 200mA AUX 2 OUTPUT (Channel 3)
To a master power windows switch would work to close windows?

The Aux 1-2 is probably another wire to eliminate from the equation considering there is no trunk and I have no idea of any other Aux options besides windows.

What would you do in my situation? Contractor with all my tools in the van. previously considered 1000 watt capacitors for an e-250, purely precautionary...

What i have done so far.

Wire _ location
1 RED/WHITE (-) 200mA TRUNK / AUX 1 OUTPUT (Channel 2) _ N/A
2 RED (+)12V CONSTANT - 15A FUSED (Main power input) _ RD / WH Battery Positive Voltage @BCM L-BU pin 3

3 BROWN (+) SIREN/HORN OUTPUT _ N/A [still unmounted siren]

4 YELLOW (+) IGNITION INPUT (See Pre-Wired Starter Kill Relay) _ PK 3 Run/Crank Ignition 1 Voltage @BCM L-GN pin 14

5 BLACK (-) CHASSIS GROUND _ @ local chassis ground screw

6 VIOLET (+) DOOR TRIGGER INPUT _ N/A

7 BLUE (-) INSTANT TRIGGER INPUT _ N/A

8 GREEN (-) DOOR TRIGGER INPUT_ TN Left Front Door Open Switch Signal @BCM GY pin 23 [[with diode band facing viper for future passenger/side/cargo door open triggers also identified ]
YE / BK Right Rear Door Open Switch Signal @BCM PK pin 14
L-GN Right Front Door Open Switch Signal @BCM PK pin 16
L-GN Rear Body Opening Open Switch Signal @BCM pin 22 ]

9 BLACK/WHITE(-) DOME LIGHT OUTPUT _ D-BU /WH  Courtesy Lamp Control @BCM NA pin 18

10 WHITE/BLUE (-) 200mA AUX 2 OUTPUT (Channel 3) _ N/A

11 WHITE (-)/(+) SELECTABLE PARKING LIGHT OUTPUT - 10A FUSED _ L-BU Headlamp Switch Park Lamp Signal @BCM NA pin 8

12 ORANGE (-) 500mA GROUND WHEN ARMED OUTPUT _ [starter kill relay]

1 BLUE
200mA (-) UNLOCK OUTPUT / (+) LOCK OUTPUT _ OG / BK 781 Driver Door Lock Switch Unlock Signal @BCM GY pin 11

3 GREEN
200mA (-) LOCK OUTPUT / (+) UNLOCK OUTPUT _ PK / BK Driver Door Lock Switch Lock Signal @BCM GY pin 12

30
GREEN
STARTER ISOLATION - KEY SIDE
87a _ NA

BLACK
STARTER ISOLATION - CAR SIDE _ NA

I own a chevy express 3500 2015 with passkey3, I'm trying to install a viper 3108v alarm and its come to my attention I need a bypass module to sync the two systems.

What module would be my best solution? Im not attempting a remote start, Im hoping both the viper fob and OEM fob will disarm and arm the whole alarm system, viper and OEM.