Been using reMarkable 2 for years, even bought their latest Paper Pro but reverted back to reMarkable 2 as it gives best writing feel. Hated constant flashing/repainting of Paper Pro and hard tapping noise while writing .
Posted this 2 years ago Remarkable e-ink tablet for deep work, and still find it’s the best eInk tablet vs Kindle Scribe and Supernote.
I write a lot, reMarkable 2 is a “dumb” notebook and that’s wha I need, saved a lot of trees.
Check out RCU, good for offline backups, transferring files, templates etc. Since you mentioned templates, create them in PNG and upload them to device, and they’ll appear in your template list.
I also use rm-hacks, but keep in mind it’s running on older software release, developers still in process of updating for latest release. Documentation. As usual, only install hacks if you know what you’re doing and at your own risk.