Repro using a Famicom cart?

[Einzelherz]

I've been lurking these parts for a while as I'm trying to make an Earthbound Zero cart. So first off, thanks to those on here who give thorough instructions

What I registered to ask though is a bit different. Would it be possible to take a Famicom game and replace only the PRG with an English one in order to play a translation of that game? Example: FF3.

FF3 seems to be a pita to make because you have to use a special/rare SMB2 cart and add a battery, resistors, etc. If you could take a Famicom FF3 and just replace the PRG (the CHR appears to be 28 pin) with the english PRG would it work in a Famicom, and subsequently an NES using a 60 to 72 pin converter?

I understand in the long run this might be more expensive, but personally, I'd prefer to have an original Famicom cart even if it's been rewired.

[Kiddo]

The hardest part of doing something like that would probably be opening the Famicom cart's outer shell.

the internals probably aren't much different from a NES cart though.