That is the only sensible option surely although it will be a tough ask finding one with the 0.85x viewfinder. High mag viewfinder M6 classics seem to be much more common or rather more easily available on the secondhand market but the OP has already stated he doesn't want an M6. Can't think why personally but then I have never understood why so many of my fellow Leica users get so hung up about camera aesthetics, the type of rewind or the advance lever etc. The cheapest option to get those would be the aforementioned M6 modded with MP advance and rewind controls, I reckon could well still come in cheaper than a 0.85x MP, here in the UK its rare to see an MP for less than £2K but I have seen a few 0.85x M6 for £1K or less.