Mikrotik, Ubiquiti, TrendNet, Mokerlink and all the other Chinese brands usually have something in this space (4-48 port managed L2 or L3 switches). A lot of the chipsets are mentioned in reviews on sites like ServeTheHome.
The sub-enterprise, prosumer, SOHO-type market is pretty strong, but OpenWRT isn't a part of it -- not sure if that was a requirement.
QNAP has the QSW-M2116P-2T2S-US. Has 16 ports of 2.5G, 2x10G (copper), and 2x10G SFP+. The 10G ports support 10G/5G/2.5G unlike the older 10G chipsets.
True, and I admit I didn't think that was a literal requirement, more so just the availability of "some" mGig or 10G ports. What would the use case be for 24px2.5G switches, you think? They seem rare.
The "home network with a NAS" is typically served with a small 4-8p 10G, while the 2.5/5G switches (particularly high density ones) are more of a bridge for orgs that have a lot of AP density and to get more out of that physical cable plant as they upgrade to WiFi 6e/7 devices on those existing wires. Gaming motherboards ship with up to 2.5/5, but again, how many switchports are needed for the SOHO market, especially when users can chain a few smaller switches together?
The price point for mostly/full mGig switches is almost an order of magnitude over what the prosumer/SOHO space prices at. UI offers a 48p but with only 16x2.5 ports at $1300. Cisco Meraki has 48p models with full mGig but that's $7-10k based on Google, and now you're out of prosumer/SOHO and squarely in enterprise platforms.
Ultimately, I do think such switches will pop up, but it'll be a little in the future as those enterprise dollars drive the cost of chipsets and transceivers down. Just not there yet to have that density at SOHO prices.
The sub-enterprise, prosumer, SOHO-type market is pretty strong, but OpenWRT isn't a part of it -- not sure if that was a requirement.