Good morning.
I've prepared a version with mtk patch from MTK git repo. These patches are applied to mac80211 mt76 and hostapd. It is also available VHT on 2g network.
Due to this commit on mac80211 if you are DFS channel on 5g network the phy1-ap0 need 10 minutes to start at the first boot.
Here the firmware:
Let me know how is the feeling