I did it!
I followed these instructions from Sam:
Android device required
1. Install Broadlink e-control app from Play store
2. Learn your remotes as per normal instructions using e-control.
3. Tap the burger settings and tap ‘Share’. Tap 'Share to other phones in WLAN. Tap Cancel.
4. Install RM Plugin Lite from Play Store
5. Tap on Device List to import Broadlink device config that was previously shared.
6. Enable HTTP bridge
7. Navigate to http://androidipaddress:9876/ 11
8. Find Code List and click on the link.
9. Find the code(s) you require.
10. Use a Hex to base64 converter to encode your codes for HA (http://en.1mu.info/tools/hexbase64.html 21)
It’s a level 9 pain in the rumpus, but eventually you get a code you can use in HA. I’ll do this once for the video explaining how to do it but after that I’m back to the Tasmotized Sonoff RF Bridge for all my RF needs.