How is proper fee rate got on Bitcoin Cash
The minRelayTxFee (which despite the name is a feerate) on BCH is 1000 satoshis per kilobyte or 1 satoshi per byte.

BCH has a blocksize limit of 32 MB and has generally had only a very small portion of the blockspace used. The current 7-day average is 27 kB blocksize. It rarely even peaks to 400 kB.

 via fork.lol

Given that BCH is currently using about 0.1% of its available blockspace, there is no need to pay a higher fee rate than minRelayTxFee.

Hence, I would recommend not to spend more time on research, but instead simply hardcode a fee rate of 1000 satoshis/kB. If you want to play it safe, you can go with 1500 or 2000 satoshis/kB. In the unlikely case that BCH traffic picks up enough to fill blocks, software support should probably improve at that time and you'll be able to reevaluate then.