okay so i got this to work even with RMB WITHOUT war sails. I have this mod eagle rising, the RBM mod it tells you to get (IDC that it says it needs warsails i dont have warsails and its working), NOT THE HARMONY RECOMMENDED on this page, there is a different HARMONY that works with older patches you can simply search it and see it and it will show you that it can work with older versions. then i went with CA europe map + lemmy. like it says. Put banner lord on version 1.2.10. i did these things and ive been playing for 3 hours with no crashes. IDK if im getting lucky or what but im not going to complain and i sure as hell aint adding no new mods that would potentially mess something up.. so far game is working as intended. I did notice A FEW TIMES 1 or 2 armies just standing in one spot doing nothing, but it was rare and sporadic, ive came across multiple other armies doing exactly what you would expect. I hope this helps ANYONE ELSE! im so relieved to be playing again with out going to nexus mods or anything haha good luck!