There may be far more to such a conversion than you assume. Try contacting the designer directly; they will already have all the information about centers of effort/resistance, ideal lead, etc., so they should be best able to make the changes at this, the design stage, rather than later on, halfway through building. It's not just as simple as swapping one stock sailplan onto another stock hullform. Placing a low-aspect rig with a bowsprit onto a hull designed for a high-aspect inboard rig may require signifigant changes to mast position, chainplate position, which in turn may be reflected by much change to the boat's internal structure. Gaff rig is very adaptable, but it's still true that some hulls take more kindly to gaff or bermudan rig.
Having said that, get a copy of John Leather's excellent Gaff Rig Handbook; more pertinant information there than any of us could write down here, including much discussion of hullform-sailplan relationships.
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