I have a raspi, running retropie set up to a crt arcade monitor via an hdmi to vga adapter and it works great.
I am sorry, I am not near the cabinet to see exactly what monitor it is as its at my sons place... It has a vga hook up and I am fairly certain it was a Wells Gardner 19K3100...
Anyway, I simply went in and Opened config file and uncommented the hdmi_safemode to get it to boot into vgamode and after a restart it looks great.
Not sure if it would be that simple for you...but I am real interested to hear how it turns out because I have a line on that exact same monitor that I am considering for an upcoming project.
Good luck!