In fully-expanded programs, do all of the desired conditional forms
reduce to #%kernel `if`?
If so, could your #%module-begin walk the fully-expanded module syntax
and replace all the #%kernel `if`s with something like (quick sketch):
(require (rename-in racket/base [if r:if]))
(define-syntax-rule (if -e -t -f)
(let ([e -e]
[f -f])
(r:if (eq? e #f)
f
(r:if (eq? e 0)
f
(r:if (eq? e null)
f
-t)))))
?
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