Simple switch using @if?

Is there a (non scripting) way of implementing a simple switch using @if along the following lines...?

@set yesorno = {dlgchoose|Yes or No?|Y+N} @if:$yesorno=Y Help @if:else Help ABOUT
Regards, AB

You can test if variables exist but I am ot sure there is a way to test them against different values outside of scripting.

I would use scripting. It makes sense as soon as you want conditional logic. Avoiding it usually just makes things harder in the end.