Hi Sixenough,
I ride a rode bike pretty regularly in NW Oregon, SW Washington. My biggest concerns are the occasional pack of feral dogs. Now that the laws
in OR and WA have changed I don't have to worry about the local recreational pharmaceutical farmers.
My usual attire is a pair of regular shorts on top of bike shorts and a vest / windbreaker (zip off sleeves for summer) and carry a camelback for water. This allows me to wear my regular belt and holster w/ M66.
The vest or jacket is long enough to cover the bottom of the holster and the camelback breaks up any outline of the revolver.
I do practice drawing from concealed and I like the K frame enough to practice regularly. Admittedly this is my personal preference but it works for me.
I suggest experimenting and see what works for you. Just have fun and be safe
Ira