Winbox port problem

Hi, we have several mikrotik together and we want to access them through internet.

One mikrotik is behind the other on the same public ip address. We did dst-nat from port 8293 to port 8291 of the mt behind.

In theory it works, but winbox always connect to default port (8291) even if you specify a different port to connect to. Only if first attempt fails on 8291 then it tries the port you specified.

As port 8291 cannot be configured what can we do to use 2 winbox working ports on same ip address? we are thinking of using firewall to “close” 8291 and redirect to another port.

Thanks