Well, with extreme motivation issues and a pretty cynical/depressed mindset, not only did Flandre love me and Tewi work with me, but Reisen's unending positivity and unconditional love eventually helped me change as a person. Now after a lot of working on myself with my tulpas by my side, I really appreciate all aspects of human life and despite having some motivation issues still can't see my life going anything but well. So, I don't think that'll necessarily be a problem. Tulpas are basically always willing to work with their host, and they're pretty darn understanding considering they share a head with you, too.
Really best not to make a tulpa with the end goal of perma-switching, but maybe they will end up possessing or fronting to experience life a little themselves, sure. I think if you think of your tulpa as a lifelong companion, treat them as their own person and all, everything should be fine. Tulpas have helped tons of hosts seemingly in your position, and I've never heard one say they wish they hadn't existed after being through all that even if it was hard. Just be sure it's what you want, though I guess it sounds like it is to you. Though if you went into this with the intent to both give them a good life, and to improve yourself, I think that'd be the healthiest and most productive mindset. No tulpa would appreciate being created just to be told "Alright this life you haven't even lived is yours now good luck", but there should be nothing stopping them from sharing your life with you like my tulpas do, eventually. Did take a few years before we started switching, though it may or may not take that long for systems who learned from .info since it didn't even exist for half the time my tulpas did, and we learned about switching (and imposition, and other things) here.