Oh I'm really glad you asked!
There's of course the easy answer that I like shoving Wander Over Yonder into any alien-adjacent media that I enjoy, but I also like to consider Woy and Gravity Falls as kind of adjacent in-and-of themselves.
I mean, they were on the same network going on at the same time, Gravity Falls ended about halfway through Woy's second season, so they're a bit intertwined in that way. And then we have Bill as a character being the most alieny alien part of the show and getting his own book that completely reignites the fandom and gives us a bunch of new scenarios, confirming a lot of backstory tidbits and expanding on them, and throwing him into the Theraprism.
The Theraprism itself is all about the rehabilitation of galactic villains, so... ding ding ding, there's that Wandery element I was subconsciously searching for. So I immediately latched onto that as an excuse to make the characters meet. After all if anybody's ever gonna make a positive impact on Bill it would be someone like Wander, in more ways than one. But god, it would still take so long and so much. The guy is like Problems Georg and he's definitely a much tougher nut to crack than probably any villain Wander has met in his entire super-long life. It's a really good thing that the Theraprism exists outside of time.
In the end, Bill would probably make just as much of an impact on Wander as Wander makes on Bill.