Looking for Tessar "look" on a digital M:
Not sure if you've considered the FSU lens Industar-22. Yes, its very inexpensive and sometimes discounted as a mere FSU lens, but its actually a fine lens in terms of performance and I believe it is more of a true Tessar than the Elmar. I happen to have 2 or 3 of this lens and I've used them to get photographs I like -- film and digital.
They are so inexpensive I think you could chance getting one (or a few) and trying it out. I don't recommend collapsing it on a digital body though
There are in existence LTM Tessar lenses (actual Tessar lens). I think Zeiss made some, but I also know there are quite a few "adapted" Tessars out there. Our longtime RFF member raid might have one. I suppose with some patience and looking, you could find one for yourself.
Or grab an I-22.