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Based on needing pitch black, I'd make a thin wooden frame to sit inside the window frame, cover with black out material and then use magnets to hold in place. Small metal plates need only be attached to window frames with decent double sided foam tape. Obvs these frames need to be taken down each morning and put somewhere.
Any roller blind or similar will always have some gap round the edge that lets light in.
Matt101
for stealth i was wondering if these would work smashed into the top of the window edges. would require 4 poles and 8 fixings but not sure if they work ok or not
edit: not sure they'd work for the middle fixings in the bay window actually. balls.