My mind is... a fun place.
UBAX + Laguna + Wyldcakes = Click once and draw 5 cards. Faust is in heaven.
Laguna would push me to play Symmetrical Visage. It would also push me to play more Events than in a normal Kate deck, so I would be predisposed to put it in Hayley. And because I have a bunch of Events, Comet looks like a very interesting choice. I CAN NOW FINALLY MAKE A HAYLEY COMET DECK.
I do agree that UBAX looks underwhelming, but not because of the Astrolabe comparison. Astrolabe has the problem that in any non-asset spam matchup, the likelihood that it actually is just an Akabatsu Mem Chip is pretty high. It only ever does something in one matchup. UBAX will at least deliver something in every matchup, just not necessarily a useful something.
As someone who plays a ton of ProCo in Sunny, Laguna looks very strong to me. I do think that it will go in decks that want Symmetrical Visage instead of ProCo. ProCo has a very regular cadence to its turns, Click ProCo twice, then Install/Play two things. It's a heck of a setup card because it pays you while you're setting up. The downside is two-fold: Firstly, you're doing nothing but setting up while you're getting value from ProCo (Because if you do it less than twice a turn, Symmetrical is just better). Secondly, that 5 cost to install is a real problem and tempo hit. (I solve it in Sunny by having more drip econ than Congress Kate, and also The Supplier. Those aren't really palatable options for most Runners, though.)
So with that said, Laguna wants Symmetrical, and only demands one click a turn if you want its effect, which you usually do. Beth also makes Laguna better... I'm really having visions of a monster Hayley Comet Laguna deck where every click she does performs at least two actions. The problem will be setup time.