MT3 collets will reduce the overhang but I don't think they are so keen on intermediate sizes like ER32 which has a much steeper taper and slots from either end. Could be wrong, usually am.

If you go ER32, I prefer the spanner with lots of teeth rather than just one. Can't slip off. Alternatively a long spanner for the top so you can brace it against the column. Just avoid heaving on two spanners at the same time if one of them isn't 100% secure, saves unexpected leaps backwards or heads colliding with milling machines depending on which way you are turning it.

When I started using ER32 I didn't realise you were supposed to hook the collet in to the nose before you put it on the chuck. Nice feature because they eject. Had to break one to find out.

If you buy ER32 check the run out as soon as it arrives. Run out is part of ER32 spec so if yours exceeds the stated tolerance you can send it back, not as advertised.

Nice to have the whole set, but most of my set are still virgin and untouched. The 7-8mm has lost it's shine along with a few of the smaller sizes. I find CNC usually requires a smaller diameter cutter because my software won't adjust the internal radii to rough out with anything big. I keep a 3/4" reduced shank cutter in that Clarkson for top facing.