It sounds like you have a lot of fun with your varied musical pursuits! I’m someone who has to read from sheet music, so I admire people like you who are able to innovate and play by ear. You have a really interesting variety of instruments.
Thank you for sharing the info about the more affordable double soprano. It’s very tempting, though I may have trouble justifying buying yet another instrument. (I play flute and handbells as well as five sizes of recorders.) I also looked at Sarah Jeffery’s page about the double recorders, which shed some more light on this instrument–this has been a fun “rabbit hole” to go down!