Indeed. I believe the Shimano peg spanner has the annoying notch in the centre which tends to get in the way. I’ve seen other brands that don’t have it.
Do they sell aftermarket for a single chainring though not sure, but they are lot easier than those knuckle destroying notched backing bolts. I like to fit a t-handle bondhus 5m in a vice to avoid slipping and destroying my skin the 6m goes to the front from memory though.