I don't know if the libera.chat bridge allows for custom plumbs. If it does, you could have the Gitter and libera.chat bridges point to that matrix.org room.
that sounds ideal
!ipBocKVYhzwSPWzCKM:libera.chatroom as the canonical source
#pytest:matrix.orgalias can point to any room regardless of its homeserver
What does this mean?
Find out if you can change which room the libera.chat bridges to.