Doubtful. Most PCI and USB adapters are designed to be clients. They don't have amplification that most routers have.
And are not concurrent dual band. If you want that, you'll need two adapters.
As a price comparison, a pair of Asus AC-68 PCIe adapters are going to be $96 a pop, for about $200. That just gets you the wireless end of things. You'll need at least 2 network ports to run a server as a router, so you may need to add on an extra NIC, or else go higher end on the motherboard if purchasing new gear to have dual NICs onboard.
The R7000 is around $185, the AC68u is About $200 also. The AC66u is $170. An Archer C7 is ~$99.
For vaguely similar capabilities, you'll pay roughly the same, possibly more, than a stand alone router. ESPECIALLY if to get good coverage you need multiple routers.
Odds are good to get the best coverage and speeds, you need two routers. Exceptions are if you live in a nice small 2,000sq-ft single story house (no basement). Or less. 2x4 construction only. No duct work in the walls.
That is if you are going for good performance instead of "just get devices on the network wirelessly". If that is what you were going with, then a couple of inexpensive N600 routers should do you also, for about $100-150 total for both.
DIY wifi router is really only because you feel like it is a fun project, not because it'll get you necessarily the best performance, range or capability. You are better off with alternate firmware and a router as an appliance if you want the best performance, range and capability. Some people DO DIY routers, but that is because they have very specific routing/QoS needs which a router as an appliance cannot do. FOR ROUTING. And it really isn't for saving money. For Wifi performance, router as an appliance is more or less where it is at.