I think that the answer is already her in the thread...
if you notice, the [lens] LTM to M [camera] adapters is approx 1mm thick. this helps adjust the LTM lens outwards by that exact 1mm to the right distance for the rangefinder coupling and the flange distance to the film plane. this need for the rangefinding coupling also implies that it cannot e done the other way around. even if you did machine a [lens] M to LTM [camera] adaptor, the rangefinding coupling will be off. and because of the flange distance is further extended, the lens distance readings will also not be correct.
given that the LTM cameras are all film (no TTL live view), you would not be able to focus properly with it... unless, as gommy put it, you find a "digital screw mount camera". it's not to say it cannot be done.