First, sorry you're unwell.
Second, it's good to respect your limitations.
Downsizing doesn't necessarily mean dropping off in the quality of the imaging you can do - just the scale.
My suggestion, like Jeantte's, is to look at widefield with a DSLR. There's several good light rigs that will make that easier - such as Vixen's Polarie or, for more solid work but still tripod-based, Losmandy's StarLapse system.
Just looking at some of the nightscape images in these fora is very inspiring. I highly recommend it.
Peter
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