Welding stiffening plate nuts?

[Turbo_Bimmer]

I had to remove my stiffening plate to access the coolant drain bolts on the engine, and was surprised to see that the 6 bolts holding the plate have nuts on the other side. Of course, the nuts need to be held with a wrench while turning the bolts, and that means removing the wheels to have access, and since both hands are busy with wrench and ratchet, holding the plate with the feet is not easy.

I was wondering if I could just weld the nuts to the sway bar bracket and the front subframe to make future removal easier.

I almost did it, but thought that there must be a reason why BMW didn't weld those nuts or make threads.

Does someone see a problem if I weld those nuts to the frame/brakets?