Might it be that some industry standard(s) exist for such device - and that your search among multiple, other vendors for that exact TQFP device - may reveal certain "commonalities?" It's doubtful that this vendor would "blaze a new trail" - thus if frustrated here (and vendor's rep is in NO WAY responsible - you must realize) your expanding search for a "near standard" may provide (some) cover & comfort... In addition - you may survey (your) board house & several others - seeking their opinion in your regard...
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