The problem is that "bypassing the Interdict" is not, on its own, useful; it's only valuable if Harry happens to have written notes on powerful magic spells that are censored by the Interdict. Apparently, there's a loophole allowing Interdict-restricted material to exist (wizards can keep notes for themselves, implied by chapter 23), but it seems unlikely that Harry would be able to get ahold of much of it. (Possible exception: Bacon's diary? Quirrell didn't think Bacon found much of interest, but he could be wrong.)

Related: since Muggle physics can apparently contribute to powerful magics (see: partial transfiguration) would the Interdict apply if Harry ever wrote a physics book? What would the Interdict do if a Muggle happened to accidentally write (presumably as fiction) the details of a powerful magic spell? Can Muggles read Interdict-restricted works?