How about using a turbo charger ? The turbine end is typically good for at least 600 degree C, it does not require high pressure but works more on flow rate. You would need dry steam to prevent longer term damage to the blades and of course a reduction drive to get the output shaft speed to a sane level. It may be possible to adapt the reduction drive from a junked Solar T32 engine to do the initial speed reduction.
It would also be neccersary to use some sort of condenser to recover the steam for re-circulation else the efficiency will be dismal.
Turbo chargers recover a significant amount of energy from the exhaust in order to compress the intake air. Several horsepower in fact to move 400-1000kg/hr of air through the air filter, compressor, intercooler and then the engine. The compressors, being so small in diameter, are not very efficient which is one of the reasons why so much heat is generated in the intake air.
Some infrastructure is also required, an oil tank for lube oil, an oil pump, which needs to run before the turbo spools up, a control system to stabilize operation, the steam generator and recovery unit. Somewhere to put it all where it won't bother your insurance co...
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