Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
Based on the insigna quidelines, an arrowhead is to be placed on the left sleeve.
But between the council patch, the unit number, training patch and position patch, there is no more place for the arrowhead.
Is it acceptable to place it on the right sleeve instead? Or somewhere else?
(You wouldn’t normally wear a troop number on shirt with a commissioner patch. But this is a policy question, so you should reach out to your council.)
If you can find some khaki velcro, you could just make one large “fuzzy” patch on your uniform blouse sleeve, and attach the relevant patches for whatever position you’re “occupying” at the time. It also helps minimize the wear-and-tear on the patches themselves.