Be wary of BRIDGE because many of them have reached EOL (End Of Life), particularly the power supply. BOOST uses more modern radios and performs better.
Yes, SONOS will share SonosNet connections with clients wired to a SONOS network port. Note that the network ports are 10/100 and the most optimistic wireless throughput expectation would be in the 30Mbps range (5-10Mbps would be more typical) and that too much non music related traffic might impact music play.
Your HIVE might be a good candidate for an EoP (Ethernet over Powerline) extender.