Ok I am seeing now why support text wasnt implemented in menu overhaul mod.
Right now I have the following scenarios on Enhanced UI bear in mind this uses parts of menu overhaul mod so same issues would be encountered, currently I am forced to choose from 3 lose scenarios, and no win.
This assumes the hext isnt loaded that disables the function.
1 - Use stock 'btl_win_a_l_01' this makes the X symbol appear whilst using modded menus, no crashes or other issues. But prevents the use of modern icons on enhanced stock and would pretty much break overhaul menu mod.
2 - Use modded 'btl_win_a_l_01' and enable the hext options to use new font in battle UI and menu UI, everything is almost ok but black box replacing X symbol.
3 - Disable one single hext the value '00919DE6 = 6C' seems to not damage any fonts, and everything looks ok with working X symbol, strangely even works if isnt present in 'btl_win_a_l_01', menu UI looks good, no alignment issues including on check menu function which emulates battle menu, however in battle menu when trying to access a spell with support effect, game crashes.
I assume DLPB was fighting these same issues which is why we are where we are.