Hi Bram, have you considered doing endurance races instead of sprint races? Despite them being very long at times they have a great positive in that for the competitor, if something was to happen it wouldn't mess up the rest of the race and the size of the gaps doesn't matter as much because the races are often 2 hours long. Sometimes even 24 hours. Just a question from a guy who's very passionate about endurance racing (especially Le Mans).
Endurance races are often done in rental karts and the unfortunate truth is all Endurance racing drivers (people that drive in 24hrs of le mans) didn't do Endurance racing in karts to get to their position instead doing these races
Start with rental karts. Arrive and drive :) You can also join my discord for your questions, there are people in there who were in similar situations: discord.gg/dE2SCedWdv