I've wished I had a tap & die set in 8-32. That is what I understand the universal thread on the inserts and points in archery are...
It should be easy to start the 8-32 tap in the front, chase the existing threads and come out the back, threading the brass 100 gr. insert all the way through. Then it's a simple matter to use all thread and weights (Gold Tip used to sell 20 gr. brass weights that screwed over 8-32 all thread), or the PDP system to continue to add weight.
Of course, Ashby and ADcock shared a system of using an "internal" footing of a parabolic tapered wooden insert that is epoxed in behind the brass insert, adds weight and ostensibly controls the flexation of the shaft behind the insert so there is no snapping off on off-angle hits + creates pretty high EFOC. Article is on here somewhere...