Doug,
Not if, just get it. Some still available on Amazon. If not JL1 then JL2. As of this moment 6 in stock.
Are you a software/firmware developer? I’ve learned that recompiling for STM32 is not a matter of pin edit in CPU header file. This is how it was in Atmel. ST is very different animal. I’ve spent two weeks trying to move single PWM pin to another port, to match JL1 hardware. Most (all) sources are created for generic STM32F103 boards, Blue Pill specifically, and have PWM on first hardware timer port. There are no switches in any source I’ve tried to select different pin for PWM. I’ve jumped on it with exactly the same expectation as in Atmel world but hit the wall quick. But I’m not a professional firmware developer, though I’m not that far from it either. At the end it was good learning experience.
I’m planning to post my BINs on GITHUB. As a fact I will do it today. Maybe not my code mods but BINs definitely.
I did post parts of my pinout work here. It is messy, I know. My code edits are not much better.
There are more hardware info scattered though various threads. I might organize it and put on GITHUB, when I have time and desire.
I did solicit cooperation at the beginning but gut zero interest, so I went solo. Still great fun and personal satisfaction for for me. And once in a while I can help someone directly - feels good.
I would give credit for sparking my interest of this activity to Francesco Grieco in his original post. This was all I needed. He actually got JL3 firmware from Wainlux before me. Then it just took of for me. I got micro OCD to make it work right. This resulted in my own firmware. (I do not have OCD 
).
And to be fair, I got a good number of people who did express their appreciation for my work. I appreciate that too.
So, I will post BINs on GITHUB. If you would like to cooperate - I will do it gladly. If you have some questions - shoot. I will help with what I can. As long as my interest in it is alive.