I sent a brief note to Kadee this morning, asking if they'll ever be offering the 11220 with a medium or large offset coupler and got this response:
From: "Sam Clarke - Kadee Quality Products Co." <[email protected]>
To: <[email protected]>
Subject: Re: Question About Other
You can acquire a package of our medium offset #1902 couplers (only) and (using a round file) file the pivoting hole large enough to swing freely on the chevron post, it won't take much filing . If you're careful you could file a notch in the hole to match the tip of the chevron to index the centering like the original.
Kadee Quality Products
All I need is to be pointed in the right direction and I won't have to chop up my S4 after all. This is why Kadee has been in business so long: real customer service. Gotta go order some #1902s.