As mentioned, Xentoars are the easiest option. I think the planar is a nice lens, but overpriced vs. 135/3.5 xenotar generally. Results will be similar from both those lenses. The only *really* great planar (which would be superior to the xenotar) is the T* one, an that's $3k+ just by itself, at least.
There are f/2.7 tessars also (the 165 comes to mind) but not sure if they are available in shutter. There are also f/3.5 tessars/xenars, in the 150-210mm range that might work, but probably require a fairly large shutter (#3 or bigger).
Agree that the Linhof is nicely made but indeed something with a focal plane shutter will give you a lot more options.
A crown graphic will fold up with a 135 xenotar inside, and a speed graphic will fold up with a 150 xenotar inside (on a custom recessed lens board).