Yes. But it is a very labour-intensive, and therefore expensive, procedure. There are two ways to do this:
a) Fill in the fret slots and rout new ones
b) Replace the fingerboard entirely.
Option a) is a very fiddly job that always leaves visible traces of the old fret slots. It also plays havoc with the machining. Moreover, the old position markers will not align correctly between the TRUE TEMPERAMENT™ fret slots, and will also need to be moved. Not recommended!
Option b) is almost always less problematic and time-consuming than option a), so ends up costing less.
Please contact us for details and pricing.