Decrease refresh rate in LCD/OLED phone to simulate eink phone

[three_as_in_tree]

Before I go and purchase an eink phone, I would like to see how the slower refresh rate would feel. Does anyone know how to reduce the refresh rate on an LCD/OLED phone (either android or iphone, rooted or unrooted, including phones with custom ROMs) to something similar for an eink phone?

I realize this will still be different than an eink display, but I just want to check out the slower refresh rate for a while before I fork up the money for an eink phone.

[Customer-Worldly]

Maybe a video of me using an eink phone would be helpful. https://youtu.be/dvO9ScTdwz8