moto
" Maybe devil is not so black "
aprox google translation from romanian

The Idea
n900 at least can / must perform usb otg. I initiated otg SRP by software as peripherial. With help of an aditional hardware maybe is possible to switch host mode using HNP.
last days I digging on datasheets and try to imagine how to isolate DP / DN signaling from usb stick, hub during HNP & SRP without compromise data lines.
I will dig my old colection of IC and will try to make a functional device
keep fingers crossed

Later edit
SRP session request protocol
HNP host negotiation protonol