Hi BD2013,
For your requirement, in my opinion, you could do as following:
1) Add an Enterprise Edition Front End with a backend SQL server to the topology
2) Point the Edge server to the new pool as next hop
2) Move the Central Management store to the new SQL server
3) Move all users to the new EE pool
4) Move all conferencing directories, response groups and so on.
I will also share the documents below
Move central Management store to another SQL server:
https://technet.microsoft.com/en-us/library/gg195644(v=ocs.14).aspx
Move users to another pool in Lync server 2013:
https://technet.microsoft.com/en-us/library/gg182600(v=ocs.15).aspx
Note: It's same to SFB server 2015.
Regards,
Alice Wang
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