Brian you are entitled to your opinion, but since accordion reeded concertinas are accordion reeds they will sound like single reeded accordions,
they also sound like accordion reed accordions because they are constructed differently, and this is reflected in the acoustic sound, this is not snobbery, you are a good player but you are showing that you understand nothing about the reasons for the construction of the concertina and why the reeds have seperate chambers., and use certain timber for the sound board.
i too have played several morse instruments and because of their construction and the use of inferior accordion reeds they sound like single reed accordions.
of course 26 keys are more limiting than 30 keys, but they are less limiting than 20keys, and cost about 1000 euros rather than 200o plus, so they are better value, if you are on a restricted budget., and offer more option song accompaniment wise than a 20 key anglo.
if the player wants to accompany songs, much depends on what keys he wants to sing in, if he can sing well in c and g, a 20 key will be fine, if he wants to sing in d and g a 20 key dg will do.
if he wants to sing in b flat he would need to get a 30 key.. what is the point of buying an accordion reed concertina which in effect sounds like a single reed accordion when you can buy a single reeded accordion BC, THAT IS FULLY CHROMATIC ,SO THAT YOU CAN PLAY IN ANY KEY FOR SONG ACCOMPANIMENT. MORSE CONCERTINAS, AND ALL ACCORDION REEDED INSTRUMENTS ARE NOTHING BUT GLORIFIED SINGLE REED ACCORDIONS PRETENDING TO BE CONCERTINAS, they do not produce the sane sound as concertina that is constructed with concertina reed and seperate reed chambers.