is this possible

I have a 86 cadillac deville sedan 4.1 and I was thinking is this possible. Example you come out to a dead battery and ur car has keyless entry and the alarm opens the door so tht means you can't open the hood cause the doors is locked and the alarm need juice to open the doors is it possbile to feed the starter lead from the battery and ground the neg post from the jumper pack to the bumper or some other piece of metal to trigger the alarm to get the doors open andjumping the car too. This hasn't happend to me I just sat in my thinking chair too long lol

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
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Xtx-500.5
"Take the faceplate off get the jumperpack"

Incomplete question,  you  haven't explained,  has this hypothetical vehicle got shaved doors?  For any normal vehicle with a flat battery  the vehicle manufacturer gives you some get out of trouble provision. Even with shaved doors, it's advisable to run a manual cable to somewhere you can get at.

Yes if you can get to the starter, you can jump the car off using that connection. If this is a concern of yours, you may want to mount a charging lug in an easier to get to location.