New answers tagged finishing
You can stack molding. Perhaps a piece of square stock, then a separate quarter round "shoe molding" as you illustrated. Be sure to keep your hardwood floor expansion gap intact. Complex molding is often built up from simpler shapes: once painted you never notice.
I had a similar problem and used a flat strip of PVC molding from Lowes (see below). You can glue its face to the base of the window if you think it will be attractive enough. You can always rip it to reduce its width with a jigsaw and put that edge down because it will be hidden by the wood molding. Then you can butt the shoe or quarter-round molding up to ...
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