Disco 4.86 uses it’s own installer not FLMM so that’s why FL E can’t see any mods as the FLMM mod directory is empty.
I guess FL E and FLMM are designed to work together but the installer and auto update approach used in Disco 4.86 replaces these pieces of software.
Which brings me back to FL Mod Studio 😉 I’ve attached a screen grab of FL Mod Studio displaying one of the systems from Disco 4.86 (one of the Gallia ones I think), essentially I think your options are either FL Mod Studio or direct ini editing.
Remember if you change any data in your client install of this (or any other mod for that matter) you could get banned from online play but if it’s for offline SP gaming it shouldn’t be an issue.