Thanks to all for the help, especially @Nerva for actually trying the exact resolution out for me. As those who know me will attest I don't really go in for snub PvP much but maybe this monitor will give me the excuse I need to practice and become somewhat competent.
Other than that, I guess HudShift will take a little playing around with to work out the proper values for this aspect ratio, but that shouldn't be too hard.