I had a friend who used a Optiplex SFF model of the 7050s so heh i guess i just got lucky and her efi worked she has the same computer but in the SFF but the difference between the sff and the "regular" models is the regular uses intel hd 630 desktop graphics but the SFF model my friend has uses the laptop graphics even though there the same desktop cpu and as you mentioned the framebuffer is different and my friend found the efi on github and it has been a ton of help and i would even go as far as to say that github has helped me alot and watching youtube videos and figuring out everything .