Re: chronic wrist pain
Most injuries in Aikido, whether people realizes or not, conforms with joints locks using "physical" strength (forcing and/or resisting). Maybe perhaps improper training.
It is tough enough knowingly to deal with arthritis. (I don't know the severity). But seems you have the love and passion to continue Aikido for all these years.
May I simply suggest: One of the key facts is to stay warm, a must, and continue practicing your Aikido--keeping moving and do not (stressing) over do it.