There was a show on The Quilt Show about spray basting on the wall. It looks doable.
I have an 8x4" piece of plywood cut in half that I put on the dining table, cover with a sheet and put newspaper all around it to spray baste.
You need to cover completely with spray but ot sturate the backing and batting. Tape or pin the batting down so it won't wrinkle.
I also found that after spraying all layers then to iron the back. The heat will loosen the spray and enable you to smooth the backing out. Do this for the top if it needs it.
Also, when you lay out the layers, smooth all down very good and then fold 1/2 of top and batting and do 1/2 at the time. Don't try and start at the top when flat on the table. This helps to smooth. Then while holding the layer start in the middle and smooth down and out.
The segment on The Quilt Show used 505 and said she had a quilt that had been spray basted 5 yrs ago and was still plyable. Be sure the spray says "temporary".