Keep in mind that the vlans on your switch are local in your situation. So it's just like you have two PoE switches. You are not doing anything fancy. You can think of vlan2 as switch2 and vlan3 as switch3.I am iut of town and get home tomorrow and will try this. Currently vlan2 is only 1 port. I will add a 2nd and try this. Hopefully it works.
You will have to re-IP your BI nic1 to be on the 192.168.1.x network along with your r7800 router. 192.168.42.x goes away. 192.168.1.x lives in VLAN2 (or think of it was switch2). 192.168.36.x lives on VLAN3 (or think of this as switch3).