If I decide to do the MSI option at some point in time. I would probably want to pull the .m2 off the card and just hope that its fairly easy and that msi hasn't done anything to make it more difficult than it needs to be.You typically won't under the QCA names. The link tends to show actual searchable products though. Sometimes though there are breadcrumbs you can pickup on based on PR's by setting up searches for keywords like google news. For instance there's about 3 different ways to find the WCN7851 which is the actual controller vs the marketed names. The MSI I mentioned is just another off shoot of the same card.
MTK/RTL options exist but typically don't perform as well or are hobbled in some way to make them cheaper for sale.
Defacto Intel options are always something that's a possibility depending on the card / CPU. As to the manual saying it supporting CNVIO it's probably a cut and paste job from the Intel version of the AMD board. It happens though not often and that's when you find out by trying it and driving yourself crazy when it doesn't work for any apparent reason. CNVIO was only released in the recent past by Intel and only throws a wrench into the mix when someone isn't paying attn or know that it's a hobbled option i.e. AX200 vs AX201 or X210/211 or AX411. The clue is the naming having the 1 at the end which will indicate it's a CNVIO option that won't work outside of Intel CPUs.
Tried searching on the controller and just about nothing came back. I'm assuming more modules will be coming out down the line.