multi-port with iptables

I usually run my wireguard on port 443. Recently I was traveling and I came across a network that was doing something weird on port 443 and I could not connect to port 443 with wireguard.

I opened other ports to connect:

iptables -A INPUT -p udp -m multiport --dports 80,554,51820,443 -j ACCEPT

iptables -t nat -A PREROUTING -p udp -m multiport --dports 80,554,51820 -j REDIRECT --to-ports 443

It would be cool if the bash script could allow us to choose a default port that we want to open:

Default port ex : 443
Alternative port : 80, 554, 51820

and configure it with iptables. This way we don't have to have several instances of wireguard on different ports.