Contrary to common myth, running an amp in bridged mono is not destructive to the amp, nor does it cause more distortion, nor any other bad things. As Jerrold and Mark Hellinger said, bridged mono is just two amp channels working together--one pushing while the other pulls, and vice-versa--to produce twice the potential voltage swing and quadruple the potential power of a single channel.
That can be a good (even vital) thing if you want a lot of headroom and only one monaural source of audio power.
Operating bridged into a 4-ohm load is electrically equivalent to operating at 2 ohms per channel, and bridged into 8 ohms is like 4 ohms on each channel.
It's not worth making more complicated than it actually is.