Hi Sandman,
I'll have a go at automating the conversion of your regular picons to the VFD picons some time this weekend. It should be easily possible to script the lot with a short bash script, that includes a tidy one-liner ImageMagick. I see you're using a Mac, so you can probably get ImageMagick view brew at Homebrew ? MacPorts driving you to drink? Try Homebrew!
With any luck, that would completely remove the ballache of having to perform conversions ever again.