I'd play the game in a heartbeat. I'd absolutely take a life of fantastic adventure if I'm able, especially if I can bring my friends along
If I wanna die, I wanna die doing something cool, and hell, I'd just be happy to fight tooth and nail on that shit, especially if there's no Lord English or doomed timelines to worry about
As for my prototypes? Easy, my Toriel plush (sure, there's a risk of the Dersites learning fire magic, but also monster souls are weaker and her pacifism might help, and if not that, I at least get a super cool motherly guide to help me out) and a nice suit (that might make Jack less likely to go full 'murder his own queen' mode)