Have not seen an Accumatch around in a long while. It was a simple coupling transformer similar to an 'autoformer' or the multi-tap transformers used in home stereo wall controls, just bigger. I have no idea whether or not the bandwidth is adequate for a full range speaker as the Accumatch was mainly used for subs.
Duane from NVS has always maintained that the Prodigy (rated at the same power as the Deviant) needed 500 watts per speaker to perform to potential.
You aren't going to be anywhere close to that kind of power, especially at a 4-ohm load. But you have a good sized amplifier that you already own. I'd go with it.