The main challenge here is not in setting up the bridge, but rather in finding an ISP that their IP ranges aren’t blocked in Turkmenistan. Bridges running on residential connections (outside Turkmenistan) and some specific ports such as 443,80,8080 seems to work well.
Just ask to the Tor User Support channel:
If you’re using tor-relay-scanner, those are actually Tor public relays that can be used as bridges and aren’t blocked in your country. However, it’s not possible to “convert” to obfs4 bridges.
The relay operator would need to shut down their public relay and install an obfs4 bridge.