Is there a way to do this?

[Elvenbane-veknilash (Elvenbane)]

Nope.

@Adreaver-undermine

3. Macros - What can they not do?

Macros cannot make smart decisions for you. They can’t cast spells based on cooldown, or check if a buff is active, or magically fit all your abilities onto one button.

As has been previously mentioned, you’re better off using a modifer when you want to cast WoG.

#showtooltip
/cast [mod:alt] Word of Glory; Flash of Light