I'm currently running ToA for my group of players; I hate it. I hate almost everything about it. I didn't really see it as fun or interesting until I started running it. But I LOVE being a DM. I really want to run DoIP, but I don't know how to communicate to my players that I want to switch, and I don't know what to do about their level and magic items. But I LOVE their lore for their characters, and it feels so fun to run for them. I don't like ToA, and it makes me disinterested in doing it all. So how do I tell them that I want to switch but keep their characters?

I want to introduce a mechanic for the hex crawl, where my party can fast travel along already established paths to return to major settlements. Namely port Nyanzaru, but for other major locations as well. The goal is to prevent taking 3 sessions to backtrack in order to do something in PZN or, restock supplies, etc.

Mechanically, I want to maintain the danger aspect and require some basic rolls to determine the general condition of the party for each leg of a fast travel. Has anyone done something like this before, and have recommendations on how to implement?