...or walk to Boardwalk & get bus from there.
The only issue with going to SSR and walking from there is that the Congress Park stop (which is where you want to walk from) is the next to last stop on the internal loop so you will be on that bus for a little while. (Grandstand, Carousel, Paddock, Congress Park, Springs)
HOWEVER, if the BWI is sharing busses with BC/YC/Swolphin, you could end up in the same predicament.