Pluto, if you don't have a previous extensive experience with rangefinders and unless you have some more SLRs to use during your apprenticeship with your new Leica, I would say don't do it, don't burn the bridges behind you.
Autofocus SLR photography is a different beast than rangefinder manual focus photography, you might find yourself completely wrong-footed. There are plenty of situations where with a RF you will be left in the dark, rangefinders can be very good but very versatile they are not.
Keep what you have, I say, and add a rangefinder system at a decent price. A Konica Hexar, a Minolta CLE, a Leica CL. Test the waters "inexpensively".
Only after a decently long practice with a rangefinder you will be able to mature a decision on whether spending an awful lot of money on a Leica MP is the right route to go.
In any case Non è tutto oro quel che luce. Beware of sirens singing, it will lead you on the rocks. You might end up selling your new Leica setup at a loss, and having to rebuild an SLR setup. If you have to sell your cameras to buy a Leica, don't do it.