Even many concertina players are not familiar with the notation you describe.

I suggest that you attach an image of the notation here.

My instrument is actually a Chemnitzer Concertina.  Here is a sample. 

Here is another style that is just for chord charts. 

This is a style I use most often. 

A lot of these numbers could probably be entered as various verses in the lyrics tool. Not entirely sure about the fractions, and the circumflex accent shapes would be a puzzle. The chords letters, of course could be entered with the chord tool; the chords as numbers would also be entered (I would think) as lyrics, perhaps attached to hidden rhythmic notes on the bottom one-line staff.

Hi Dan:

You might consider the Finale Numerics, new to Finale 2012, for the numbers above the staff. There's even a ^ symbol you could use in that font.

https://usermanuals.finalemusic.com/FinaleMac/Content/Finale/Figured_bass.htm

Cheers,

Michael Johnson

VP, Professional Notation

MakeMusic

Dan Fabeck,

Now I understand. I was thinking of the English Concertina.

The Chemnitzer Konzertina is a quite different beast.

The left hand notation can be done with a custom staff + the Chord Tool + expressions for the Tone Grip numbers.

Here is an example

Unfortunately I can not upload a Finale document in this forum.

Can I persuade you to join “the other Finale Forum” at

http://www.finaleforum.com/index.php 

and post your question there?

In that other forum upload of Finale documents seems to be working.