I had an interesting exchange of email with a Bimare representative and he suggested that they could transform a X16 into a F16 in the factory: Shorter mast, larger spi and main, longer beams. He quoted me around 12.5K€ for one, weight should be in the 105Kg range.

This would be a solo boat only, the X16 hulls are not designed for a jib and are not reinforced in the right areas to install one. You could sail with two crew as there is two trapezes, nothing in the F16 rules prevent you racing with less sail area, but don't expect to be competitive then.

I figure somebody might be interested in getting one, could be an interesting alternative.