Note that if you use tripod-mounted hot shoes, radio transmitters or slave flashes with any rangefinder camera out there, you will need to use full manual flash with a flashmeter for exposure metering. There aren't that many rangefinders with flash metering anyway (Minolta CLE, Leica M6TTL/M7/M8), and they need extra contacts for flash control which most of these solutions will not contain.
Depending on how many flashes you want to use, when setting up shots this may give you anything from minor hassles in lighting control to O. Winston Link-esque hassles. Results can be interesting, though.