Bon Mot Equivalents.

[WWHsmackdown]

Are there any skill equivalents to bon mot for helping casters target fortitude or reflex?

[Kyrone]

No

[Ascalaphus]

You mean for debuffing enemy Fort/Ref to make those spells land better?

Well the obvious one is Intimidation/Demoralize.

[Alchemic_Genius]

The scoundrel rogue can feint to nerf reflex with a class feat, but it requires you to be a rogue, so that kinda offsets any benefit gained; though it does allow "Eldritch Tricksters" land spells just as good as their full caster contemporaries against a single target, so that's something

[gesalt]

Not only is there no other skill feat to target those saves, the only similar feat is evangelize which inflicts stupify and has a 24hr lockout per opponent.

[Ruzza]

Catfolk get Catfolk Dance which is a Performance check versus Reflex to lower Reflex saves. However, it is versus adjacent creatures, so it's something that may not rank high for many spellcasters.

[Themetricsystem]

Other than the examples offered here and a handful of other generic debuffs, no, and I for one feel that it should PROBABLY stay that way given just how insanely good (borderline broken) Bon Mot actually is.