This is a major chord, but it retains a certain suspended quality by containing the 3rd and 4th a semitone apart. If you can stretch to making the F# an F natural on the 3rd fret of the fourth ...

F#9sus4 (Image credit: Future) This isn’t comfortable, but it’s worth it for the sound! It seems to work best in an F# minor context, but the lack of 3rd means it’ll also work in F# major. In the long ...