There are others that aren’t Chinese but nothing anywhere near the price bracket you’ll get from GL.Inet. I wouldn’t trust them either, I’d just take the hit and lose the app. Since it’s OpenWRT I wouldn’t be surprised if there’s an alternative to the apps. Flashing standard OpenWRT to them is really easy, you just download it from the site and flash through the firmware upgrade option, no dramas. Many VPNs will have instructions on how to set up their service on OpenWRT.
I’ve never even seen a cockroach in the UK, I didn’t realise they were a thing here.