The BL5000 will be fine with a BM7000 & offer 2 way communication - right up until the point where you accidentally drop it & it stops working, they aren't particularly robust I'm afraid.
Other options are :- Beolink 1000, MCP6500/5500, Beo4/5/6 & of course the Beolink 7000.
Chris.
The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.