I know Kaiyodo used to make Revoltech joint packs.
http://www.toy-wave.com/eng/detail.php?id=...yword=revoltech
As for drilling an extra hole, I'm not sure that's needed. They made the hole because the original ball joint hole is bigger then the revoltech peg but if you put a correct size ball on the revoltech peg you should be able to plug that in no problem.