Great initiative - I do have some php knowledge and experience but a task like maintaining a phpList module is a bit out of my comfort zone. Like you, I can manage testing and debugging.
Another plea to make this a standard phpList feature - I just don’t understand why that has not happened yet. I’m using this great plugin to allow some people with little PC knowledge to submit a campaign. No need to login and go through all the different steps - just send a mail and confirm, it can’t get much easier …
Going to take a look at your fork - making it work under php 7.x was also on my list …