call amazon and ask them politely to remove it, if one says no…hang up and call back…repeat process until you get a representative who wants to help you.
I have the latest one I bought over the summer without special offers and the HA app will not run on it (can’t connect to HA instance) even after hacking it to allow for the play store. I use the browser version. Sorry my bad latest version will work, just re-installed it.
You can disable the amazon launcher, etc and probably special offers through ADB. But you need to disable updates as they will wipe all those settings out on the next update.