eink refresh rate is 7fps when "overclocked" Totally decent.
You list a DX which had a sucky refresh rate,
However isotherms firmware hack with 1 bit mode is practically instant compared to the original firmware. Which sucked quite badly.
Also Geekmaster discovered a way to improve the 1.5 FPS of the DX too... Don't recall if he ever published it.
But I take your point.
Do a kickstarter.
btw. no need to cross-post. All the relevant people are right here 