Whatever distance he does, there will always be somebody who says he didn't really beat Merckx because some unregulated variable (e.g. clothing) made it easier after 45 years of development. He'd be better off trying to beat the real hour record, which is still held by Chris Boardman at 56.375km
Since Boardman's 1996 hour was set using the superman position it's obviously difficult to compare. But do your sums give you a guesstimate of who had the bigger engine out of Boardman and Wiggins?
Whatever distance he does, there will always be somebody who says he didn't really beat Merckx because some unregulated variable (e.g. clothing) made it easier after 45 years of development. He'd be better off trying to beat the real hour record, which is still held by Chris Boardman at 56.375km