One of the upcoming SHIELD Experience versions (7.2.x) will support color space switching as well (Rec. 709 <-> Rec. 2020) which is supposed to fix a lot of color problems some TVs have.
I’m not sure if this requires the resolution switching feature to be implemented by the player as well in order to be effective.
Just in case this feature does get selected for implementation it sure is worth checking if we can get this feature for free or with a very small effort.