Linen Tallet Katan

Question

Dear Rav Abadi, I read that, for Sephardim, in order to fulfill the mizva Middeoraita, it is required to wear a tallet katan in wool or linen. However, I read in an excerpt from the book "Tzel heharim" by Hertzel Hillel Yitzhak that some authorities claims (Shulchan Aruch, Orach Haiym 9:6, Kaf HaHaiym 9:16, Yalkut Yossef, Sheerit Yossef Vol I, 9-10:2, Halacha Berura Vol I, 9:18) that we should not wear a linen tallit katan in order to avoid the risk that a person would attach a woolen thread of blue (techelet), and so will trangress the shatnez prohibition. I do not wear any techeles on my zizit, and the only reason why I was wandering about linen tallet katan is because I would like to do the mizva properly but I have difficulties in wearing a wool zizit, especially in the summer. Thanks for your help. Best, David