I think with a bit of manipulation on a top bar you may be able to increase bee population, and production. By adding empty bars in to the middle of the brood super as the population expands and providing fresh bars between the brood and honey to encourage the bees to draw and fill the space left in the colony.
My thinking is. The value of the extra honey you can produce with a Langstroth, will pay for the higher equipment costs and extractor.