You are better off clamping if you can make a wooden block with notches for the frets, so that the clamps apply pressure to the fingerboard, not the frets. it doesn't have to be a work of art.
You might be able to clamp the heel so that it presses on to the body by putting a piece of wood (use double sided tape to hold it in place) across the rear of the neck-block inside the neck pickup cavity (you really should have waited to install the electrics, but you should be able to remove the pickup). This might be easier if you can make up a small block with a flat back and a front that's contoured to match the heel as best you can, so that the clamp has two flat surfaces to operate on.
If you can't do this, then you can (after protecting the sides of the body first, wrap some thin rope around the body and then tighten it by putting a stick through the rope and giving some turns. Don't overdo it as you'll also be putting pressure on the lower horn in particular, but something to hold the heel in place against the body is always nice.
I'd mask off the body around the neck area to prevent accidental damage when clamping and also if you get any glue squeezing out over time that you don't catch and wipe off, then it should mainly be on the masking and not the body.
On the electrics - have you installed and fitted your bridge earth wire? As you haven't put your bridge posts support inserts in at the time you took the photo (as far as I could see), then you may have missed this, so do it now before you totally forget!
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