I’m just noting that there is a new variant of the venerable LiJiANi RD239 with SSB and App control for sale. It’s at AliExpress for about $111 US.
The product photo shows the same Radio-C app used by some of the Retekess / HanRangDa / Zhiwhis / Raddy models.
If interested, check out the manual.
I rarely use my Rd239, although it has some nice features, including backlit keys, weather band and VHF. The company has always been responsive when I asked for firmware updates.