This sounds like an awesome solution tbh: logging into a site to share a tweet seems like a very reasonable thing to make POSH working again.
Also, if this allows you to add achievements, soulbound NFTs and stuff like these, it would be great and would be a no-brainer (at least for me) to perform only one additional task to get even more rewards for my activity.
I was very sad about the APY change and the difficult time ahead of POSH, but now it looks like you took advantage of that to make POSH even better!
About the gamification aspect, did you take into consideration the idea of a collaboration with @hive.buzz? They gamified activity on Hive, while you are going to gamify activity outside Hive but done to help spread awareness about Hive, so you are basicallly completing each other from this point of view :)
Myeah but they never really did anything with nft's or you know, something fun.