Instead of the current way that partners have maximum of 3 lifetime subs they can give to viewers and 2 to bots, I'd like to see this updated to something like you can give free sub for one year to 3 viewers (or more for partners and maybe 1 for affiliates).
This would be a good update because life happens and maybe one of your lifetime subs dies or otherwise stops coming to your streams, like if you give your girl/boyfriend a free sub and then few years later you break up you could then give the free sub to someone else.

As for bots you could add a new role that can use all the channel emotes (including bit unlocks), but instead of being able to use them globally all the emotes would work like follower emotes and just limit this role so only 2 accounts (or honestly just 1 might be enough) can have it at the same time.

Current lifetime subs that exist already I'd just leave them be and concider them as legacy product.