Both software support and hardware quality are very good. Bonus points for having a Tux key instead of a Windows key ;-) . Maybe they’ve got something in your range?
Agreed, developing print stylesheets is a PITA. But the principle proof, that HTML + CSS is capable of being the authoring format for whole books, is brought by PrinceXML, https://www.princexml.com/, for years now.
It’s just that browsers suck with handling print styles.
The splitting is something, that the CSS authors already did with CSS 3 and its single modules (specification-wise). But authors don’t really see anything of that in their day-to-day work.
https://www.tuxedocomputers.com/en#
Both software support and hardware quality are very good. Bonus points for having a Tux key instead of a Windows key ;-) . Maybe they’ve got something in your range?