As you know, Wario Land 4 is nearly completely decompiled at the moment, opening the door to more technically advanced mods in years to come. Meanwhile, Wario Land 1 and 3 seem to already have disassemblies as is:
https://github.com/Kak2X/wl...
whatever happens, i hope the wario games get half as much attention in the modding community as mario games have, they deserve it. there's a lot of potential for some cool stuff.