Thanks all, sounds like I am following most of your advice already based on what I had in previous posts. I am folding the t-shirt into a square with rough edges in the middle so not exposed.
What I am getting is tiny fibers not lint per se. These come off with a very light wed and dry sand with 2000 grit. More noticeable on the very dark Japan brown on the back. The top is looking pretty good so far with no issues.
I had a few dramas with my binding getting stained early on but after a clean and painting on the tru-oil everything is sealed now and staying put.
I will try and find a few other tshirts which can be sacrificed. I will also try the fresh polish method. I like sticky tape idea to test clothes.