Wide Angle Converter for 24mm FD L

[M Joel W]

Apparently Chris Probst has been using the 35mm AF f1.4 Minolta lens as a substitute for the 35mm K35. 

But what substitute is there for the 18mm?

I was looking at the Canon Scoopic attachment but it requires focusing into Macro mode I suspect past the 24mm FD L's close focus. 

I only need S35 coverage.