A late response.
An alternative would be to save the presentation view as a high-resolution bitmap
It can be exported as Video. If by "high-resolution bitmap", 4K is enough 3840x2160, export the video as 4K and then extract a frame using, for example, VLC Player. You can do that even if your working monitor is only FullHd for example.
Some parameters of the export can be changed using macros. For example, you can change the standard export of 30fps to 60.
Here is a discussion of a macro (not working perfectly) but I want to mention something
It indicates the vertical resolution. Probably you can change it to 8K.
In the comments, a Git is mentioned. PPspliT wich I have not tested but sounds promising.