Hi,
there is also something like multiboot for Duo but I think not so universal as on the dreams. BlackHole (VU image) has meoboot included. I do not know how stable it is and which images work in meoboot but for a play box it might be worth a try. Personally I did not test it and I would not test it on my main receiver.

DMM always build interesting boxes and gave good support but in the last 2 years they are far behind in the hardware and I would also said that they are behind in the software thanks to PLi, OE-alliance and last but not least ViX.

ciao