rs system with a twist

I am looking for some help picking out an alarm/RS combo.

03 Ford Explorer, currently has the OEM alarm installed(horn honks if door is opened type). Also not sure if it makes a difference but I have seen it talked about here so I will mention it. The keyless on the truck will work when the car is running, I can lock and unlock from the fob while driving.

I have a few requirements

I would like remote start, but do not need 1 mile range, ect. 500-1000 feet is all that I need.

No overly large key fob, would like to stay as close to the Ford fob size as possible.

I have the key pad on the door that I would very much like to keep as part of the system. Sometimes I am outside and need to get into the truck so the key pad makes it possible without having to run inside for the keys, I would very much like to retain that aspect.

I want to keep the progressive unlock where the drivers door only unlocks on the first press and all other doors unlock on the second press.

Additional outputs are not a necessity however I would take the window vent option if I could if not then Lock, Unlock, Start, and Rear window release(trunk opening) is all I need.

Would like something that is timmed run, so if I start it and take longer than I thought to get out there it will shut itself off after like 10 or 15 min.

Yes I will be installing it myself.

As for the key pad on the door. If the truck is running I can get out and hit the bottom two buttons and the truck will lock, then I can key in the code and unlock it, so the key pad remains functional while the engine is running.

As far as bypass, I have 2 keys for the truck so I could program a third and use that or I could go with the NKR system. My decision here would probably be based on most cost effective method. I am not going to sacrifice one of my functional keys so buying a new one would be a must if I went with the 556U correct?

My concerne with the exterior key pad is this. If I get out of the truck and arm it with the alarm, then later on I am outside and use the key pad to unlock the truck and open the door won't the alarm be triggered? Is there any way that unlocking the door with the exterior key pad will also dis arm the alarm?

You are correct in your thinking, the keypad would be lost. There is a way to do this but it is a little complicated. You could use separate units, one an alarm upgrade that works directly off your factory remote. This will allow the keypad to work the alarm as arm and disarm are controlled from lock motor pulses. When the motor sees a lock pulse it arms, when the drivers motor sees an unlock pulse it turns off the alarm. Next you can get a RS upgrade that again works off the factory remote. You first need to make sure the range on your factory remote is good enough for you. Can you lock your doors from in your house or from whereever you will want to use it? If so your good to go. I have done this and it's a bit more work but i have had some dealers that insist on using the factory remote and this is the only way.

Pursuit makes both units, the alarm is a PRO 9232N and the RS is a PRO 9075N. As for bypass, totally up to you. The cheapest way is to buy  a key on Ebay, have Ace hardware cut it(it's free) and program yourself. A key box is cheap...

It seems that the easiest way is to go the NKR route.

That out of the way it seems that the next easiest thing to do is just to keep the factory alarm and just add a remote start system that works off of the OEM remote.

I tried to Google the PRO 9232N and the PRO 9075N but my Google fu must be weak today.

Also I know Code Alarm has the CA411 which is an add on RS that uses the OEM fob.