Game Genie to an IPS is simple, but RAM changing to an IPS requires some assembly knowledge. It's not necessarily difficult, but you do need to learn what to do.
There is no simple way to take a RAM value you want to change and say "make it always happen in the ROM". There are different methods to get what you want. In your case, what most likely happens is that $160 in RAM gets filled with the correct value and then that gets messed around with. Somewhere in the ROM is an instruction that says "store this value to that address". You need to change that instruction to store a different value. To find out which instruction it is, you need to use a debugger with breakpoints.
So if you're willing to learn a little bit about assembly, you can figure it out. I can't tell you exactly what's going on in Burai Fighter right now since I'm out of the house, but I'd have to reach the final boss, which I don't really fancy doing.