Not sure, but have you tried gogol maps webview wrapper?
Aegis should do (rock solid job in combination with MS services for my job)
Check out compatibility of banking apps and other apps (no guarantees!)
I do not use proton apps so I cannot answer these but joplin is a nice markdown notes tool.
(I doubt proton integrates well with the system apps as it is a proprietary solution - from what I know … others are more knowledgeable on that behalf)
And you can install alternative launchers that might have the features you prefer and use them instead of built in Bliss, only I cannot recommend any - I am sure others can…
In case you are not aware of it: you can group app icons in Bliss, maybe that helps a bit.