With regard to tablets, you may wish to look into Replicant running on the
Samsung Galaxy Tab 2, either the 7 inch or 10 inch versions.
https://www.replicant.us/supported-devices.php
Unfortunately it looks like Techno ethical no longer sells those tablets with
Replicant pre-installed, nor does it offer an installation service for them,
but maybe you could ask
https://tehnoetic.com/index.php?route=information/contact
Or you may want to use their smartphones instead - the biggest one, with a
5.5 inch screen, could perhaps be called a "phablet" and has stylus support
https://tehnoetic.com/mobile-devices/tet-n2
