Probably workplace safety regs problem with forks meant to carry loads around being modified / annealed by torching a hole in them. Not a problem if you're solo though!
Actually got the idea from the trailer store I bought my 18' PJ car (tractor) hauler from. The shop worker used a skidsteer fork with a ball popped in a hole near the end to roll trailers around inside the shop and outside to deliver to me. Looks like it's work for them for years. And this a a shop that does highway truck and trailer inspections too! And the tech that was moving around my unit was an inspector.
So I'm not too worried about messing up the forks. The hole is about 4-5" back from the tip, through full-thickness fork metal, so unless I were to wedge the forks tip between some massive rocks and try to pry at them using the forks right at the spot the hole is, with full tractor power and weight, then the forks aren't going to bend.
Oh wait, I already did that! And they didn't bend.