I appreciate your help here. Your first option doesn't have N. The two radio approach is something I might consider, if the cost doesn't double.
I'm concerned that ALL Engenius products running client bridge mode firmware may have the same bug. So if the EOR7550 is nothing more than...
The EOR7550 is doing MAC masquerading, to perform the bridging function. So all users connected to Radio 2, use the bridge's MAC address when asking for DHCP across Radio 1 uplink. Several routers I've tried do give out an IP and generally the EOR7550 and the router does pass traffic just fine...
I have several EOR7550 units. By default these units come configured as Client Bridges. I believe the intended operation is to have these dual radio units configured as A) MAIN AP with Radio 1 and 2 as AP, and B) use additional EOR7550 units as REMOTE extenders, operating in Client Bridge...