I play the piano accordion and have done so for most of my life. Whilst I do not play the button accordion, I say why not give it a go! You can only benefit from the experience. What a wonderful journey of learning and discovery.
In my country, Scotland, the chromatic button accordion is not popular, and it is difficult to find any reasonable selections of chromatic button instruments. Maybe it's the same where you are - I don't know. But where there is a will there is a way. Search and with a bit of luck you will surely find something. You can learn all the good (and even the less good) aspects of the instrument.
If you have played the piano accordion for a very long time and enjoy it, it would be a shame to completely walk away from it. Maybe it depends on your personality or learning style, but I could never walk away from the piano accordion. I would definitely try other types of accordions, especially C griff converter but not at the expense of losing piano accordion. As with everything in life, we have to make our decision and go play.
Good luck!