Well I saw a post that line reel clips are hard to get.

Bing Batta-boom

3D printer to the rescue.

Here's one.  I regret that I don't have time now to post an stl of it and the reel it fits. I tried to print a clip that goes halfway around the reel.  That required support and was ugly.  I settled for one that started and finished with max angle of 45 degrees to the printer bed.  It works a treat.