Hey Hayden,
I put in a Steam ticket and inquired about VAC bans in terms of fixing HUDS for eyefinity/surround users...here's their response:
Thank you for contacting Steam Support.
We do not provide analysis of third party software for VAC compliance. Any third party software, skins or other modifications you use in conjunction with Steam should be done at your own discretion.
Only cheats (modifications designed to give one player an advantage over other players) will trigger a VAC ban.
If you have questions about a specific third party application, please contact the developer of the application for assistance.
For more information on the VAC System, please see this article:
Title: Valve Anti-Cheat System (VAC)
URL: https://support.steampowered.com/kb_article.php?ref=7849-RADZ-6869
If you have any further questions, please let us know.
From the sounds of it, your hard work seems safe from VAC bans. Looking forward to your CS:GO fix...TIA