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Setar is an Iranian instrument that is able to play korons (half-flats) because of its irregular fretboard:
I know it's doable in guitars with bending the strings. But I wish to change my guitar's fretboard to look like a setar's so that I can play half-flats with fingers easily.
Is it possible?
Yes!
You could always have a custom guitar built, or modify an existing guitar: Have the fretboard replaced and have the frets set to match the spacing on a Setar. But then the guitar would not be usable as a standard guitar.
In order to allow for different intonations, some innovators (like Tolgahan Çoğulu in the video below) have devised ways to make movable frets on a guitar. In the first one, individual partial-width frets move in slots for adjustment:
As you probably know, there are instruments from other traditions with movable frets (e.g. Sitar, Bağlama). The methods used on those instruments could also be adapted to a guitar-like instrument.
You may also notice in the description area of the above video, links to some other approaches:
In case the video links go dead, here are some still photos of the inventor (and his son Atlas) with the three kinds of microtonal guitar:
Movable and Lego:
Automatic Movable:
Of course it is possible to add (or remove) frets from a fingerboard. It will require some skill in modifying guitars on your part or you can contract someone to do it for you. You would need to have a very clear idea of the exact pitches you want in order to calculate where the frets need to be. Another issue is whether you can keep the pre-existing frets or have to move them because of differences in temperament. You can either do it to a pre existing guitar or perhaps start fresh with a new neck or fingerboard.
