The rig not much longer than the boat so you should be OK having some stick out behind. We just use old lifejackets as padding and strap it to the bow pulpit and the stern pulpit. Also have to get some padding at the cabin top, but no special brackets.

We do use a scissor-style A-frame made from two pieces of 2" PVC pipe bolted together when stepping and lowering the mast (sorry, no pictures). The legs of the A-frame are tied to the stern pulpit at deck level, and the high point of the A is about 6' off the deck at the transom of the boat. The bolt holding the pieces of PVC is about 1' from the end of the pipes creating a cradle to hold the mast in.

This way nobody is stuck holding the mast overhead while the hinge pin is inserted/removed. This has added a lot of safety to the rigging/unrigging process. However once the mast base is freed, we remove the A-frame and tie the mast to the pulpits with whatever is handy. It will end up being supported at both ends and in the middle and shouldn't bounce around much at all.

Many Moore 24s use a cradle on a pole that inserts in the outboard socket, but I would be wary of doing that on the E27. The outboard sockets are not particularly strong and repairing them could be a big job. Rear pulpit is stronger...