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There's no free ride on turbo's, the added restriction in the exhaust puts a higher load on the engine, the question is can you extract more energy from it than the amount that is added back by the additional load.
Extracting waste heat is difficult in the sense of getting to a point of usable heat differential, outside of making hot water or heating the cabin which only requires a differential in the order of 50-100°C, to produce mechanical motion you generally require a differential of 300°C +. There have been some attempts to use lower temps with specially designed stirling engines, but they require highly volatile working fluids and are generally operated at a partial vacuum, so not really something an ecomodder is going to do with an old twostroke and some PVC pipe.
As for the heat pump, again it's efficiency is governed by a heat differential, it can effectively move heat from one place to another, but to use it to increase heat potential it's efficiency begins to fall rapidly, it is nothing more than a compressor and is governed by the same laws.
I applaud you for putting ideas out there, but I have yet to see any workable proposal for utilizing waste heat from the ICE.
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