Support missions should always show up. It does not matter if it is mine or the original ones. If you can't see the support missions there is a problem with the DLCs not been recognized correctly. I had these problems with the disc game too.
My...
Can I run this on a disc copy of the game via sdcafiine or must it be via a dumped copy only? I tried but I can't tell if the mod is working as expected, support missions are still not showing up on the terminal.
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi