Yeah this is the best solution. There are a whole bunch of products out there that provide this functionality, you'll see them described as EDID Minder or EDID Detective.
The "fancy" ones will run upwards of USD 100, though they do more. These will certainly work.
There are some low cost ones too around USD 22: https://www.amazon.com/dp/B0722NVQHX/
I am not sure how reliable they are, but for that price is worth trying.
Empyfree wrote: ↑Sat Apr 20, 2019 16:03
You could try an Edid minder inserted between the card and projector. The card will always see the edid minder as being connected leaving you free to turn the projectors on and off.