I'm basically thinking to do L2 with a wifi bridge (for 10.1.0.0), and then have a L3 gigabit switch for 10.2.0.0 and routing between them. I'd do it in one device, but I imagine that an 8+ port ...

I'd just create a new VLAN, and let the switches do their L3 thing. It should work just fine. Put the VLAN onto the production 5510 port that the fiber connects to, this will prevent unnecessary ...