There really is nothing available that will be like a polaroid proof,
maybe instax but the colors are a bit wonky
I wouldn't do anything off of a kickstarter,
#55 has problems ( if it was 30 years ago and actually polaroid I'd say do #59 )
I wouldn't do anything expired.
if you hav a darkroom and assistant I'd suggest :
Have an assistant develop 4x5 paper positives. Invite the subject(s) into the darkroom if they really need to see the image appear before their eyes.
but even that will take a tinker or too because unless your final product is going to be THAT. .. its ( and everything else ) will look nothing like
what you final image might be like. we used to go through boxes and boxes of the polaroid stuff, there was nothing like it.
are you going to make enlargements from your negatives in the dark or are they going to be negative scans and machine prints ?
if they are going to be negative scans and machine prints, do the whole thing in Ilford direct positive .. just be aware it is slow and like any paper negative, sort of contrast rich...
and unlike a regular paper negative you can't use a yellow filter to tame the contrast because it isn't VC paper.
have fun!
john