For FE7, you just need to go to $3FCD and change D0 to E0. Somewhere there is a function that compares the song ID to 0x5A if it’s < 0x7F or below. (Maybe @Brendor can elaborate on this a little more?)
As Brendor said…
[11:28:44 AM] No-Bark Noonan: changing d0 to e0 negates the comparison
[11:28:44 AM] No-Bark Noonan: and treats every value like the title
We believe in FE8 the same holds true for changing $2900 to 0C E0 but I haven’t had the chance to test it yet - perhaps someone like @AlfredKamon would like to?