I have very little modding experience but I’ll share what I do know: it will be a huge and complicated pain and there may not be any way to do it without ruining the pretty HRAP2 top. It will probably death and hell if it’s your first experience with stick modding/building, and a HRAP2 would be a real purdy thing to wreck.
Some alternate options that may be worth considering:
A Sanwa Flash may be much easier to put in. Unfortunately I don’t believe it can fit an LB-30N bat top. The Flash is discontinued but I’m pretty sure you’ll still be able to get one with a bit of digging. I’ve never used a Flash; I couldn’t tell you if it will feel like the P360 so be sure to ask around about this first.
Do you like the Japanese button layout, or are you desparately trying to convert your only stick into something else? If you just wish you had an American setup, someone in the Trading Outlet might be willing to swap with you for a MAS.
If you decide you can and do want to create some two-country ocean-spanning hybrid frankenstick, by all means do. Your own stick should be the way YOU like it, after all! I might tell you you’re sick but I support you 100%.
This is all advice meant for a beginner, from a beginner. I don’t know how much you know, but if you know less than me then I hope this helps you!