Of all the builds that I have done in the last 40 years that I have cut off the rivets and replaced with bolts, I have had O problems with them falling out. Just use some blue loctite and some grade 8 hardware and you will be good to go..
__________________
62 Willys 4wd Pickup : 72 C-10 swb 504 stroker
09 Taco 3" lift 33" tires: 90 K-5 blazer (plow truck):
RIP Ross Little brother