Hi guys,
I want a device that can connect to a third party Wifi (STA) and provide another Wifi (AP) and (optionally) route traffic via WireGuard.
Since I want to use it on travels, AP shall be available even when STA is not present, to be able to reconfigure STA. I've read that some Wifi Chips don't support this?
WireGuard throughput should be at least 50 Mbit/s.
It should support 2,4 and 5 GHz and be (relatively) compact.
I'm from germany and budget softlimit is 150 Euro.
Use Travelmate to account for this situation.
I really like the GL.inet MT3000.
Dunno about wireguard thruput, because only connecting to my socks proxy server in FRA. For this I use a very cheap Cudy TR1200. In worst case, for higher requirements, a Cudy TR3000 definitely will suffice. Both can be powered via USB from notebook, or a power pack. Because Wireguard is UDP, you might run into problems on some airports, hotels etc., where only http(s) traffic allowed. Thus, I use socks5 proxy connection to TCP port 443 of my own VPS in FRA. My Cudy TR1200 is good enough for German TV, then 
Cudy TR1200 uses MT7628N which is basically not usable when there is VPN, I have 2 routers with this SoC, it cannot do any kind of encryption otherwise it simply crashes.
GL-MT3000 or if the used GL-MT1300 still available they are good.
In fact even the normal Cudy WR3000 isn't really that big which can still be used for travel purpose.
Frankly speaking, I am a bit skeptical regarding your opinion about the MT7628AN. Having used the slower MT7620 with wireguard in many production devices, I can not imagine, that the 7628 should be worse. Wanted to add wg to the Cudy anyway, thus I will verify your statement. I have to note, that I practically always build my images from src, omitting redundant packages/modules, with quite some optimizations applied. Could make some difference.
Well if you already have customized version it's a different story, but I also own the MT7620N based GL-INET MT300Nv1 which hangs when higher load is on it, Wireguard is definitely one thing can put loading on the SoC.
I guess not many people will try to rebuild everything like you to use on such an old platform, not to mention that OP hasn't purchased anything yet, I can't see any reason to go for such an old one, now even the MT7621 based routers are not quite available on market.
might be related to this PR
The Cudy TR3000 is also a solid option and often cheaper compared to GL-MT3000