I have a MAclaran Vogue. It is heavier than the Quest but has bigger wheels.

i love it. It folds so easily and comes with a sleeping bag too.

If you are happy carrying your bubs have a look at the different carriers you can get - Pikkolo, mei tais, ergo, slings, wraps.

you may still need something/some way of holding your bub while you are folding the stroller at the stop. A sling would work well for that I think. Not sure I haven't used one. you could always hand bub to a stranger but in Melbourne I am not sure about the safety of this. I think I could fold my stroller one handed but would be tricky with a 9.5kg lump on my hip.

Good luck