The big dissadvantage of sleeves seems to be you would need to be exact and very few DIY'ers have CAD experience. I can think of a simple way to give yourself more trial and error without hurting your tent. Sew a small strip of fabric in the tent seam and then sew the sleeve to this strip. That way you can sew and resew the sleeve to the strip and not put holes in your tent body. Sew a very short webbing loop to the seam and then use paracord to make the loop that secures the pole. Paracord can be tied and retied to the correct length. Another idea. Use the paracord to loop over the tent pole and secure it with a button type closer.
If I were to personally do it, the sleeve and paracord/button idea would seem to be best. Or scrap an old tent and use those.
I had superhuman powers, but my therapist took them away.