You could use a Benchmark DAC1 Pre as very compact preamp/DAC run into a fairly compact Class D amp like the Channel Island D100 - you would save space and some money. The Benchmark works on any voltage and most digital amps do as well. And the Benchmark would also be a decent headphone amp.
I remember contacting Bryston and Naim a few years ago about voltage compatibility and both required a change of transformer or at least a re-soldering of the existing ones inside which would void the warranty.
I remember contacting Bryston and Naim a few years ago about voltage compatibility and both required a change of transformer or at least a re-soldering of the existing ones inside which would void the warranty.