German dialectology seems to have quite the influence on Unicode, as a lot of the recent Latin and combining character blocks are partly or entirely dedicated to the subject. Medieval times must've been weird.
Anyway, I personally have neither seen nor used these obscure combining characters, but if you happen to need them, they're here.
Unfortunately, as with the UnStructed UCAS block that I published about an hour ago, "Unstructed: Combining Diacritical Marks Extended" was apparently too long of a name for FS to handle, so I had to abbreviate it.
For this font:
Unicode Block: Combining Diacritical Marks Extended (Added in U7.0)
Unicode Range: 1AB0~1AFF
Font Range: 0100~014F
Unicode Link: http://www.unicode.org/charts/PDF/U1AB0.pdf
For more information on USFs see "UnStructed: Syriac Supplement"
Spacing Modifier Letters
Combining Diacritical Marks
Pixel Font version 1.5
For all the supported characters, see here: pastebin.com/As5gzSf0This is a clone