Currently the bicycle capacity and cover icon use the same icon. To differentiate these quests, there should at lest be a slight modification (somehow put a roof into the icon of the cover quest?).
Sure, you can do it.
I'll have a look. However, maybe better push your SVG changes first through, to prevent merge conflicts then.
I'd suggest something like this:

To simplify this, I just dropped the _P_. It is quite clear that the app can only ask about bike parking stands and not about bikes driving around. Also the street sign-design makes everything clear.
Here is an optimized SVG version of the icon alone:
StreetComplete_quest_bikecover.zip
Edit: Inkscape SVG added: StreetComplete_quest_bikecover.zip
Ok
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I'd suggest something like this:

To simplify this, I just dropped the _P_. It is quite clear that the app can only ask about bike parking stands and not about bikes driving around. Also the street sign-design makes everything clear.