Chacham: You are assuming that tcheiles can count as lavan when it is more or less than necessary. I disagree. The Torah clearly differentiates between tzitzis hakanaf and pesil techeiles. So you are left without the proper amount of lavan or techeiles and are therefore not wearing tzitzis.(this is without the chumra of min kanaf-veha raya a beged of techeiles requires two different types of strings because techeiles cannot count as tzitzis hakanaf even if it is min kanaf) The analogy to tefillin is incorrect because it is not assur to wear the other pair. So wear both and you’re for sure yotzei(as the shulchan aruch in fact recommends). However a beged without tzitzis is assur. So unless you are machria, wear all lavan (or all techeiles-according to most opinions).
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