I imagine you'd like input from fellow sufferers. There are lots of folks here with OA/DJD, probably not so many with RA.
Treatment of RA has dramatically improved over the past 15 years. The key is to be treated by a well-trained rheumatologist. Most people do really well these days.
I can't tell from your description if you have Raymauds. If you do, I would not ride in cold weather. However, for your job I would invest in high quality gloves and winter foot ware and use appropriately.
I know I sound like the Pied Piper of Bentland, but I have pretty nasty DJD of the c spine and I loooooove my bent.
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Momento mori, amor fati.