Hi Magnus and welcome,
I don't know of any but this is a very good question and a problem I have had since I began writing songs a few months back. Below is how I need to tackle it, and I will say it is becoming easier, but it is still a challenge for me to coordinate the voice with the hands. I think like everything else guitar, lots of patience and practice will be required.
Best of luck
This year the diet is definitely gonna stick!