Tzitzit with Different Knots from Maaser Funds

Hello. I have many undershirt tzitzit with the regular string and Ashkenazi knot. I want to buy from maaser funds for some of the tzitzit (in honor of Shabbat) a techelet string with a thick string and the other strings also thick, and for some of the tzitzit (for weekdays) thicker ones that I will tie with a Sephardic knot. Is this possible?

Hello and Happy Hanukkah

There is no problem tying tzitzit with different knots. However, there is no reason to do it differently from the custom of your community. 

It is forbidden to purchase items for mitzvot for personal use from maaser funds.  

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