VLANs for Linksys WRT1900AC as AP+Switch

I have an old WRT1900AC V1 and I am considering flashing it to OpenWrt to be used as wireless AP plus switch in my living room. I hardly use WiFi so that aspect is primarily for guests or on the extremely rare occasion that I use my laptop from the couch. It would be very convenient to also use it as a GbE switch in that room for connecting game consoles, etc.

I have a managed switch at the junction of the house's CAT 5e wiring, which will be fed from a BPI-R3 primary router that will run a WireGuard VPN. That router is in the basement and I'm strongly considering not turning on its radios at all if I can make the WRT1900AC do what I want. But I'd rather not waste days attempting that if it's simply not going to work.

If anyone can answer a couple of preliminary questions to save me that time, I'd really appreciate it:

  1. What's the current status of the wireless driver for this device? I've read older posts about it being unsupported and problematic, and then a couple of more recent comments about some new activity and patches but no actual reports on how it works.

  2. Is it physically possible to set up this device so I'd have one VLAN with the 2.4GHz wireless and 2 LAN ports, and a second VLAN with the 5GHz wireless and the other 2 LAN ports? I may have a fundamental misconception about how the hardware works so I apologize if this is a really stupid question.

The goal of question 2 is to let me (or guests) choose to be behind the VPN or not based on which SSID or LAN port we connect to on the WRT1900AC (i.e. XBox -> no VPN, friend's phone -> no VPN, laptop -> VPN, etc). The VLANs would be tagged for traversing the upstream managed switch and being handled by the primary router.

Yes. This is not a problem. In fact, you can have both bands active for each VLAN if you want.

I don't have experience with the device, so I'll leave this for others to answer. AFAIK, it is fine, but I don't want to mislead you since I could be wrong.