It seems to me that ABC notation would work as long as there are good people out there who offer conversion sites. I can take an ABC and turn it to sticks & dots easily. I use the converter at mandolintab.net

I used to use a different converter site, and then one day a notice appeared that the site had been bombarded by so many vandals (my language), that the operator was giving up and taking it down. I hope this kind of thing doesn't keep happening.

As for a solfa system, I am very musical, but I have never been able to listen to an interval and say whether it's a third, a fifth, or even an octave. That's the same as not being able to say whether it's do, mi or so. I've never figured out what you're supposed to do with those.

Joe, I salute you for wanting to post melodies, and I hope you are able to do it with little effort.