Can you achieve similar benefits in a ported box with two woofers, one facing the normal way and one reversed (presumably then connected in opposite phase so they drive the external wavefront in phase)?

Have you had any thoughts about using push-pull in other designs - for example a dual-woofer corner horn with one facing into the box and one facing out? Could two cheaper woofers perform as well as or better than one expensive woofer in such a configuration?