You seem upbeat and thinking clearly about your situation, it is hard to read and my best wishes to you.
Although morbid the Swiss practice the "Swedish Death Cleaning" starting around 65 years old. I have begun this process while I still can move heavy stuff around. I have three Corvettes and two Harleys to deal with. The Harleys are going, but the vettes are staying. I enjoy them too much and they could easily be sold at the appropriate time.
I also have the other side of the coin going in my household, without giving up to much my wife has been diagnosed with a rather severe neurological disorder. And she has quite a bit of very nice "things" that she holds dear. No way can I expect her to give them up.
Which brings me to my 2 cents...prioritize all of your audio holdings and keep what gives you the most joy and solace. Create a detailed plan to dispose of whatever it is you decide to keep. And do the Swedish thing on what you decide not to keep.
My kids don't want any of my audio gear which sort of pains me because they grew up in a house where music was a near constant. And so it goes.
I'm very sorry to hear of your troubles and I will send some thoughts up to the big man.
Regards,
barts