A deck stepped mast requires generally heftier scantlings than keel stepped, so what weight aloft you save with shortened rig and single spreader is partly or perhaps fully off-set by the thicker mast walls.
And you lose sail area. I'd rather have a suitable sail area and a good reefing system than be stuck with excessive genoa as the only way to move in normal light winds.
At the minimum, I'd spend a good deal of time and maybe money with the company to see just how wizard this idea is.
G'luck
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