Override Not Port 80 Requirement

I have tsplus installed on a system with the web server using non-standard ports, due to other software (veeam) which requires the standard ports. I have the firewall redirect port 80 and port 443 to the non-standard ports. But, when I go to generate the free https certificate, it won’t let me, saying the web server isn’t listening on port 80. I realize this is an unusual use case, but would it be difficult to add a Proceed Anyway button at that point?