hey I'm right there with you. I didn't want to type out all the details but the customer didn't want to use any tools they had to "learn". All they wanted to do was be able to do is view a file structured similarly to CVS. View, filter, and sort alphabetically. This was like a subtask of a bigger project.
Bottom line is we were like "hey don't waste your money on this request, there are tons of tools that can do this"
Their response was essentially "we contracted you, you guys figure it out." LOL okay, pay us for 1 additional month and you can have a program to load your csv and sort it
for speech recognition there is "futo voice" which not only works better than Google's speech talk-to-type by allowing the user to fluently speak, but it also works offline and doesn't upload voice recordings anywhere. You won't be able to use it with gboard because google will not allow the use of another talk-to-speech engine with gboard, you'll have to download another keyboard first.
mobile banking is an unnecessary luxary. Moving money around/paying CC biils often takes days to go through anyway so the urgency of "doing it now" mobily can wait until you're at your desktop.
Push notifications, I'll give you. Without any services some apps cannot recieve push notifications. As the other user suggested, using a pixel with grapheneos, you can install sandboxes google services or microG and then have full functionality.
On grapheneOS you can choose which apps have access to internet/data much more fine-grained that what google allows you.