I recommend splitting this macro in two so you don't need to escape out of the 
template language:

(define-syntax (macro stx)
  (syntax-parse stx
    [(_ (var1:id ...) (~and vars (var2:id ...))
     #'(begin (macro/var2 (#freeze var1) vars) ...)]))

(define-syntax (macro/var2 stx
  (syntax-parse stx
    [(_ var1/freeze (var2:id ...))
     (begin (do-something var1/freeze var2) ...)]))

This also lets you get more information out of the macro stepper when 
debugging, since you'll see two separate expansion steps.

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