It could easily be done, but I wouldn't recommend it in the Croft, certainly if yours is anything like mine, as it didn't like the reduction in gain. It's different with the Goldpoint, as there is no gain there to begin with!

If you decide to get an SA4M (although I would opt for a 24-stepper instead and save yourself some money), then I would ask Duncan to rewire the switches, as he did in mine, from a series to a 'shunt-type series' (thereby obtaining some of the benefits of both worlds), or probably better still, ask him to build you a passive preamp from scratch, using all your favourite 'bits'.

In that respect, I'd go for 'blank' Goldpoint dual-mono switches, and then fill them with Z-foils. That would be awesome! It's probably the way mine will end up

Marco.