My Caravanner now is nearly torn apart for a shell on floor replace as well. To me you just can't start looking for shortcuts. Most of this stuff has to be done correctly or you or someone else will be undoing your shortcuts later with a needed proper repair.
Another issue on this toggle idea is that there's just way too much in the way of old fasteners that have to come out of the C channel before the new floor goes back in. No way you can do it with a bunch of holes cut into your skin. That inside skin just has to come off.
I'm a noob here too, but I can guarantee you that the hours you spend reading what others have done are going to pay off big time for you. Most of the major threads I've read over and over and continue to pick up new ideas that help. Too many really capable people have done restorations using mostly the same techniques for them to have missed a better way.
cheers,
steve