[tor-relays] Firewall rules as a "replacement" for MyFamily on a bridge?

Hi,

I have been running 2 middle relays for a while and now fired up an obfs4 bridge (in a relay-free AS no less ;) as well.

I've been thinking, as MyFamily is a no-no for bridges, how about firewalling the bridge from my nodes? If I add rules on my bridge that prevent it from connecting to my other relays and prevent my other relays from connecting to it (using iptables' -j REJECT, which results in a "connection refused", as if the tcp port was closed), it would be technically impossible for my bridge to inadvertently build a circuit through one of my other relays. (Well, it could of course still choose them as the second hop.)

Does this make any sense at all? Will this break stuff?

Thanks!

Best, Marco