I finally looped back to this and used AppSheet to create a great app for my wife and I to use to track spending by group and category for the month, see all uncategorized transactions, and view and edit all transactions. I was inspired by this post from @mandpeklund : Mobile App Creation Tutorial with Google AppSheet
This solves a bunch of issues for me, including not trying to use Google Sheets on my phone, which crashes with Tiller, being able to easily categorize new transactions on my phone, and to facilitate our goal of collaborating better on budgeting for the new year.