You bring up a well-documented, hard-coded limitation here that applies to HE Dashboards and "HTML" tiles. It's unclear to me whether this 1024-character limit occurs at the Maker API stage, or the Dashboard app itself.
But suffice to say DB app creators themselves are free to exceed this by allowing much larger HTML fields if they so choose. I'm certain that hubiVue and SharpTools are essentially unrestricted in this regard. Neither requires you to fiddle with JSON or CSS (if you don't want to), which are among the things that keep me away from the native app.
Other devs like @thebearmay likewise don't hard-code an upper size (that I know of) in drivers such as Tile Template Generator which spits out HTML blobs parsed from selected device attributes (very cool, btw!).
Kudos to you for thinking outside the box. That's the overriding mantra of Hubitat!! If you don't like something or need a feature, you're free to roll your own.
