If you have no HTTP(S) Server running at home (on that machine, or which is accessibly from the internet) you can change the address for the sync protocol in the main syncthing settings.
I changed mine to listen to the default 0.0.0.0:22000 plus the one which is needed to get through my company firewall, resulting (in your case) in 0.0.0.0:22000, 0.0.0.0:433
You should disable UPnP and set up the port forwarding in your home router manually, as UPnP will probably not map 443 externally.
I don’t know if global discovery will work with both adresses. I entered my second port + dyndns address in the device config on the node at work.