My wife's fork should be the same as yours then so drilling should be ok. Maybe.
These were made by Dia Compe long ago and they quit selling/making them. They go for a lot of money in Japan usually cause theyre on the rare side.
I believe that Kalavinka is now making a new version.
Give em a shout and see whats up.
Just throwing out ideas. YOu may not like the look of these.