Thank you very much!!!
After removing controllable forge the Game did crash but it could tell me whats wrong and i had to change some Mods to other Versions to work with minecolonies:
donum_ornamentum needet to be 1.20-1-0-139-Beta or above
Structturize 1.20.1-1.0.662-Beta or above
blockui 1.20.1-0.0.101-Alpha or above
That did indeed solve the issue; I wasn't able to launch the modpack properly, but by (sadly) removing the mod "Anger Management" for my 1.16.5 modpack, I have been able to launch the modpack successfully all the way to the main menu screen without any crashes or issues.
Thank you TileEntity for your assistance on such short notice, it was exceedingly helpful!