First of all, Sorry about my Languages. English is not my Basic Language.
I like this Idea but... skip or deny all those "Gainings" and "Unlooking" feature. Tbh I would leave and cancel Patrons, I playing TMP since 2015 and don't want to restart completely from the beginning. Just add XP, Levels & Prestige plus all those Icons. That would looks really nice.
I would recommend to get XP by driving goods to destination (Finishing). No matter which Goods just depending by Weight and Distance, Keep the XP Rates very low should be more challanging (also gets Penalties by Damaging the Good). Driving without Goods and without Finishing any Delivery gets no XP.
I also see another Problem. If I am myself, i immediately would try to get the highest Prestige Rank by reloading the Auto Save and finish my route (like +2500 km and 30 Tons) in periode. This should also be denied too.
But all around. Great Idea.