I finally had some time and added a drag and drop version including a small guide on how to find the folders who need to be replaced.
I hope it works for everyone.
for everything go to your steam library -> steamapps -> common -> F1 2021 -> 2021 asset_groups
from there on you go to:
-for the emblem go to ui_package -> texture_arrays -> customisation -> cstm_badge_large and replace the two emblem_formula files inside the emblem folder
-for the suit and helmet go to character_package -> team_livery and replace the 2021-custom-devonbutler folder
-for the livery go to f1_2021_vehicle_package -> teams and replace the four myteam folders and the fom_car folder
Garage Crew, etc. are planned, but I won't have much time over the next weeks, so please be patient with me.
Also I'm thinking about doing a second version of the car livery. If you are interested let me know.