No it wouldn't in enough numbers to make it viable. A perfect storm of mechanical complexity, cost, potential unreliability, and very very small potential market of nuts... erm.. enthusiasts. It's a niche within a niche within a niche.
Given how good, simple and reliable you can make a non-regulated PCP it's a no-brainer. It's a shame as I love all the self contained powerplants (except gas rams which are the devil's work!)