I’m a maincombat and have a sword in main and dagger in off. If I’d have a macro that would switch them ambush and switch them back that would be so amazing and very much appreciated 
I use
#showtooltip Ambush(Rank 6)
/equipslot 16 The Shadowfoot Stabber
/cast Ambush(Rank 6)
Replace “The Shadowfoot Stabber” with your weapon. One press, swaps weapon, next cast abush.
In Stealth I have a dagger to ambush one and a sword to garrote one. So I can swap back and forth as I approach depending on what I attacking.
In combat I have ones for Sword to Sin Strike, Sword to Hemo, Dagger to Backstab. For the incombat ones, I add that line of start attack.
Hemo example:
#showtooltip Hemorrhage(Rank 3)
/startattack
/equipslot 16 Thrash Blade
/cast Hemorrhage(Rank 3)
BS example:
#showtooltip Backstab(Rank 8)
/equipslot 16 The Shadowfoot Stabber
/cast Backstab(Rank 8)
I took start attack out of BS cause when solo I do not want to break my gouge / blind if I spam.
In the marco…slot 16 is main hand and can add /change a line to have 17, your off hand.