How were you able to edit Chapter 11 and swap MaMU in for FeMU? I'd like to do this exact thing in my game but have no idea how to go around it.
It's actually rather simple. You need to edit two files for it to work properly.
The first file is in the scripts folder:
011.cmb. Open it with a hex editor. Search for the bytes
83 76 83 8C 83 43 83 84 81 5B 8F 97. Now you have to change the last two bytes -
8F 97- to
92 6A every time. The cutscenes will now work for MaMU instead of FeMU - only there are no dialogues.
For this, go to m -> E(or U, depending on where you live). The file you nee is
011.bin.lz. Decompress it using FEAT to get a message archive you can edit. Since you already have the gay patch installed all you need to edit are the parts starting with
MID_012_OP2, since the other instance - MID_011_ED2 - already has dialogue inserted for MaMU marriage.
Look for the text beginning with
MID_012_OP2_プレイヤー女. You can either copy it and insert new text for MaMU like I did - which was nothing more than unneccessary work. Or you can simple change all the FeMU texts. To do this you need to change every gender indicator from F to M. (Sound effects, etc. You'll find them.) Also you need to change
女 to
男. You should also read the dialogues themselves and check if there are any parts that need to be rewritten - I personally found some needed changing so I changed 'em.
You can compare to the MID_011_ED2 section of the archive and look at the differences between the MaMU and FeMU parts to check what exactly needs changing.
If you did everything correctly all cutscenes and dialogues should play like they are supposed to - featuring MaMU if he's married to Chrom.
In the same way you can change chapter 13 to work with MaMU marriage. Look for the 013.cmb file, change FeMU for MaMU. Look for the 013.bin.lz message archive, change FeMU to MaMU...
I don't remember if there are other instances where you'd need to edit something to make it fit the MaMU marriage but I guess they'll all work pretty much this way.