Thanks for the response.
I wouldn't mind the bigger size and extra weight if it was necessary, but I don't use more than half the bass buttons. I can't imagine I would need anything more than the four rows...I don't think I'll ever be at a pro level - or even close to it.
I also thought the cost to overhaul an accordion was comparable to buying a new one. Maybe I was misinformed about that.
I'm not interested in trading/selling my grandmother's accordion. I don't hate it, I just thought there'd be something out there easier to play, easier to carry (I like to stand when I play), and more importantly, something with a cleaner tone and quicker key response.
And yes, I am physically unfit.
Thanks again for any help!