You can de-fret it, but if there are nibs on the ends of the frets you'll have to cut them (simple to do if you're using a set of fret pullers). After that you need to precisely cut the filler lines (I use veneers) to the length of each fret slot. You could use a trapezoidal shaped piece to completely fill the top of the fretslot, but I'd use a gap filling super glue, or at least a titebond type glue, under the fret line material to fill in any empty space under the new line. This is a time consuming job! I typically upcharge $50 to do refrets with binding, but for fretless conversions with binding I upcharge $80, and it should probably be $100! In this instance, time really is money.
