I have been looking at different rims, offsets, adding Bora spacers or not, etc... This is some of the information I have using a factory all black (not the beadlock) rim
The front and rear studs are the same length. Rims are all identical. The studs are a total of 1 9/16" long but only 1 3/8" of actual thread than the last 3/16" is a thinner section.
Factory rims have pockets in the back of them. If you use a 1" spacer (or up to 1 1/2") you can put the excess stud into the pocket. It looks to be a good 1/2" deep but this I have not fully measured. I am also not sure if each rim would be the same.
I am not too comfortable cutting the stud but I would be ok with cutting part of the 3/16" end. My recommendation would be to put a nut on the stud and just let the 3/16" stick out. Grind off that little bIt. The nut is there so you do not grind any real thread.
If you have aftermarket rims they may not have those pockets in the back so the studs should not exceed the spacer.