If it can be of any help, according to the MediaTek MT7688 Datasheet, the CPU chipset supports AES128/256CBC, WEP64/128, TKIP, AES, WPA, WPA2, WAPI and WPS: PBC, PIN. For any other VPN or security features, you have to build it yourself, or find the right software package.

Perhaps an alternative would be to use an unsecured connection to a router that does support PEAP?