If I understand you well, the intended use of your nested delimiters can be 
more or less described as syntactic sugar for #reader, with auto-detection of 
where the string ends:

(filter foo? 
        (python-ish-list-comprehend 
         «thing for x in sqlish(«select * from foo») where some_pred(x)»))

could be rewritten as:

(filter foo? 
        #reader"python-ish-list-comprehend.rkt" thing for x in 
#reader"sqlish.rkt" select * from foo<READER 2 STOPS HERE> where 
some_pred(x)<READER 1 STOPS HERE>

-- 
Georges

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