Rod, are you using the 127 frac on the GTi? As for a powerbank, I have the Celestron that came with my 6SE, so that's not an issue (plus a couple of smaller ones I made from spare 18650 cells).
Motorbike camping, yep, done a bit of that but it came to a halt with the arrival of bloody covid. I still managed to take unnecessary stuff on a bike!
Edit:6 hrs. later. The rain that was coming slipped away so I got out the bike and went to the city to have an actual look at the mounts. Dumb idjit, I should have just called them instead! 1 GTi in stock (in carton), then it's backorder, no EQ35's in stock, due late November but unsure if there will be a price-rise (if I place an order now it will be at the current price).
I hate making decisions when under pressure.