I hang out on TUG too and follow the II deposits there. I wouldn’t be at all surprised if you got a Kidani savanna view. So I’d book the same for your 1 night, and when you get the II confirmation, call MS to get the Disney confirmation number and ask them to put a “continuing stay” notification on both reservation numbers. That’s the standard note telling the room assigners that you want to stay in the same villa. That request has a high likelihood of being filled, since they’d like to keep you in the same villa to save on housekeeping.
Yes, requesting near Zazu elevator makes sense if you want the shortest walk from Kidani to Jambo. The walk from front door to front door is 10-15 minutes depending on how fast you walk, so from the Zazu elevator would be much shorter. There’s also a shuttle that runs from front door to front door pretty much continuously. That would be an option if the weather is bad.
I guess BLT is obvious, but I like WL, even CCV, much better, especially if booking a studio. The BLT studios are just too tiny — DH and I spent one night in one and it was enough. Did you know there’s now a walkway from Poly, through GF, to the MK? Obviously it’s a longer walk to MK than from BLT, but it’s something to consider if you love Poly.