They do have the XG series. I actually have a SW-16-XG for the backplane on my server for my SAN. Local access 10G using SFP+ ports are definitely doable if you don’t need to cross any VLANs or do any routing.
I haven’t used one personally but the cheapest they have is the Flex-XG switch it seems, which seems pretty cheap for 10G.
I’d say they should work fine if you can disable the routing and have them act just like WiFi access points. Then connect the LAN ports to the Ubiquiti and you should be good. That said, I’m not familiar with those devices so take this as you will.
The only compatibility issues I was thinking about was PoE-related mainly but those look like they need their own power supplies. Ubiquiti used to push a nonstandard PoE spec with some of their APs but I don’t think that’s the case anymore.
I have an older version but I think they all work pretty much the same. It should work fine for you depending on the brand/voltage of the APs you have currently.
Everyone has some great recommendations. I didn’t see anything about Ubiquiti so I’ll throw it out there since I’ve had a good experience with them. The Dream Machine is for home/small office setups and is fairly inexpensive for what it does: https://store.ui.com/us/en/collections/unifi-dream-router.
Edit: it’s now the dream router. They changed the name it seems.
Ohh, sorry I misread your comment. Yeah, 2.5G WAN is a little trickier unless you go with something enterprise grade it seems.