Thanks for posing this question. I'm interested also. I would pair such a keyboard with this mount

https://www.amazon.com/gp/product/B07SJZT7Q7

that I've used and loved for years and mentioned before on

https://www.reddit.com/r/ErgoMobileComputers/

as with a handheld I can hold it at eye-level and I'm a bit of a stickler for neck ergo. With this full kit for me it would move out of cargo shorts pocket size and into small backpack territory.

Ever since I discovered the Roost

https://www.therooststand.com/

I find myself snobby about never wanting to hunch over a standalone laptop anymore, including when using one in bed (details in my post history).

This reminds me of the Tim Ferriss podcast "what purchase of $100 or less has made your life better" question. These two devices have dramatically improved ergonomics for me in various circumstances:

https://www.amazon.com/gp/product/B07SJZT7Q7 (I'll twist it around and sit comfortably on part of the gooseneck, which holds the phone up in front of me for a video call from the couch)

https://www.amazon.com/gp/product/B01C9KG8IG (Game changer for neck and shoulders when not at a proper workstation. Use with portable mouse and keyboard.)