I have suffered on & off with right wrist issues. Below my little finger, a bone there towards the outside of my upper wrist/hand can be very painful at times. Helps if I could rest it, although resting a wrist is next to impossible lol. At times I use a flexi wrist support, not a splint. Have you tried a wrist support? Seems to be easier to live with than a splint. Still gives you movement with some support.
Mine seems to improve, then something simple like turning a door knob sets it off again.
That lovely weather you have with no clouds in the sky, surely must help your A.S? I visited Oz a number of years ago. Really enjoyed it.