I know the hill well. I always get pinched by a bus at the Canada Line station then hammer that hill with 81 gear inches. On my road bike I sit down and try to keep my cadence at 90. I go noticeably slower.
I feel there is no shame in wanting to continue being a fixed roadie. I've spent my life without a derailleur, my road bike is on CL and getting picked up tonight.
Going slower isn't that big of a deal. In this town, a road bike gets you places a fixed bike might not go.