I haven't used Pathfinder Pawns specifically, but I've crafted hundreds of paper minis from peintableheroes.com and others. What I did? Standard printer, standard paper and a cheap laminator. This gives you a far more resilient mini than cardstock. And bases are easily craftable as well. I've seen suggestions for using glue and old coins, bulldog clips, etc. What I actually used were 1 inch felt pads designed to go on the bottom of furniture. I would then print a ground/grass/stone texture and stick that to the adhesive side and cut a slit into them for the paper mini. This gave me flexible and cheap bases that I could use with the TV screen I was using for battlemaps without worrying about scratches

I have the PDF files and printed them on A4, then glued 2 blank A4 together and glued the PDF prints on either side of that. Gave it enough thickness and we are still using them a few years later. Took a while to do all the gluing but I would say it was worth it for us.

For the stands I bought some bull clips to stand them upright while waiting for an Amazon order of these

They were cheaper at the time I bought them but they hold the pawns well.