I can confirm that TL-AC1750 Archer A7 V5 can be flashed from TP-Link GUI
I have US version of the device.
Archer A7 v5 started with 1.0.11 Build 20190810 rel.50990. I upgraded it to latest TP-Link firmware that was available. In my case it was 1.0.15 Build 20200721 rel.40773.
After that I flashed it with openwrt-19.07.4-ath79-generic-tplink_archer-a7-v5-squashfs-factory.bin
File was not renamed.
Worked great.