Once upon a time (like the 90s or early 00s) I wanted to use wide angle lenses on a screw mount RF body, and at the time it was not nearly as easy to find adapters for mount X to mount Y. While now you can find them on ebay, order from Fotodiox, etc.
At the time, the only inexpensive wide angle for LTM was the Russian 35/2.8. To go wider, what I eventually found was a T-mount for M39. Then I got a couple of old T-mount wide angle lenses (marketed by Soligor or Vivitar probably). These had non-automatic preset apertures, which is actually an advantage for using on an adapter. (For some auto-aperture adapted SLR lenses, the adapter needs to keep the lens stopped down; it depends on whether the SLR lens mechanism defaults to open or stopped down.)
The T-mount lenses were a bit of a hokey solution and today, I might just buy a Nikon F to M39 adapter. Other brands to M39 may be available but not as easy to find.
The other other option is to pony up for eg a Cosina Voigtlander wide angle in LTM.