@brianjmc1
Having the OpenVPN server listening on localhost with port forwardings is a way that clients can use different IPs to connect to a single server. These may also be assigned to different interfaces.
I don't think, that this is really necessary in your case, however.
I'd just setup all services to listen on the WAN IP, which is 111.222.333.445 during the setup, and then change it to 111.222.333.444.
Therefor pfSense provides the WAN alias.
Why do you think, that this would mess up something?
I setup all settings, ipsec tunnels as Live non PFsense router
I expect, that IPSec and any other client attempts to connect if enabled anyway.
Maybe the remote site accepts only the origin router IP, so it will fail. But I would disable it till the old router is shut down.