My wife got me into a project, so does stand up well for a outside sign?
https://miratecextira.com/extira-exterior-panels/

I know its not PVC or the $350 a panel stuff that Pros use but it seems to be pretty tough stuff and says it carves or routs well. 5 Year Exterior Warranty. My local Menards store carries it in 3/4 inch thick sheets for about $80.