Hi Don
No, the shortest track section in wide radius (5200 series) is the 5205 (5° 43'°).
When I was using M track (for decades):
- using a short pieces of a different radius was no issue. Even for shorter pieces, the smallest is 8 mm long
- the M Track was rather flexible and tolerated some degree of "geometry abuse".

I never did it with M track but with C Track: to cut track pieces to what I wanted
Here is an example of a 3 way switch that has suffered of "geometry abuse" (so maybe you could do the same with M track).
The idea is to cut 2 track pieces and assemble them mechanically and electrically (glue, rail joiners and soldering) to obtain a special track piece terminated with regular extremities (joiners and center rail contact tongue)

Cheers
Jean

Can you please post a pic of what you are trying to do? I've been doing this a long time and I never had to cut a 5205.

Why stop there?

5103 is a normal 1/1 curve with feeder cables.
5102 is a 1/4 curve (7,5º)