BC - can you reach your primaries from the helm? If so, I think you may be able to tack the genoa single handed. Your boat is going to want a genoa for the light days on the Chesapeake, which really precludes using a self tacking arrangement.
I single hand and can tack my 145 on my own, with or without the help of the autopilot managing the tack.
Worst, worst case....roll up the genoa, tack the main and pull out the genoa on the new tack.
I'd suggest you try to avoid adding this hardware....but there is no harm in trying out your centerline block idea this season. Try it and let us know how it works.