I've done this a few times,
https://12in12en.mystrikingly.com/even with my 12 yr old son and a TM member, and it's a blast. No convoys, sight see if you want, but you won't get round all the cols. No back up/ reps/ support bus, just your tool kit, common sense and self reliance. Best suited to those that really want to drive their cars, the main day is a 12 hour "event" . Great accommodation organised for you, good food, good varied company- ages, cars, demographics and fun. All for largely less than a third of the cost. And you get a chance to have a personalised memoir book with you on the cover!
https://12in12en.mystrikingly.com/
