The nice thing about McCormack is that you can send it to SMcAudio for an upgrade.
I had them convert my DNA-1's to monoblocks, in addition to other upgrades.
They also wanted to know my speakers in order to make an upgrade that fit.
I know Maggy's can be a challenge due to impedance dips. Steve McC. believes Zero Autoformers to be a great solution for electrostatic speakers, as well as others.
I would call SMcAudio, and get their take on this. Pat usually answers the phone.
FWIW, if you can find a non-working DNA amp, all the better, as SMc guts it when you upgrade.
Bob