The original Garrot Bros used to retip Koetsu's with their microscanner styli and also made modifications as and when necessary to the motors due to poor build quality.
However the issue remains - with a retip are you going to end up with a pile of glue adding to tip mass ? Very much depends on the quality of the retip.
In my view you should get a quote from koetsu to compare to the other options - Expert Stylus/Anamighty/new Garrott.