It's possible if you do a wipe and do a fresh install. You essentially boot into the Sequoia installer. I'm also looking at possibly picking up a M5 MBP and was the first things I looked into.
The Shield Pro is perfect for me and I have no reason to upgrade. Have mine downgraded and de-bloated using this guide [0] running a custom launcher. Like you said being Android and more open helps a lot.
The install script is still there, you don't have to use the ISO [0]. I prefer to do my own btrfs subvolumes, partitioning, tweaks, etc and just run the script after a base install. Uninstalling anything is a matter of seconds from the provided menus.
Other than the popular password managers mentioned you can try Password Pusher [0]. It's open source, can be self-hosted, and has options like expire link after n loads or days.
Unfortunately they are not planning home lab things anytime soon, per a recent podcast episode [0].
If you want to play around with their Hubris OS: "You wanna buy an STM32H753 eval board. You can download Hubris, and then you’ve got – you’ve got an Oxide computer. You have it for 20 bucks.”
I've heard this argument before, and I point out Kubernetes to them. Is that code base complex enough, because it's pure Go doing just fine and runs on plenty of systems?
A quote from Henry Petroski that has stuck with me:
“The most amazing achievement of the computer software industry is its continuing cancellation of the steady and staggering gains made by the computer hardware industry.”
[ my public key: https://keybase.io/sgloutnikov; my proof: https://keybase.io/sgloutnikov/sigs/_Sq9C6VWyspKN6xQIOgKdIdzbmj3YzmjBhtGOi6vMFY ]