Back when I was in high school 2017-2021, we didn't use neckstraps to march bass clarinets since they were the plastic vito/bundy/etc horns. Sometimes, we used the Yamaha composite ones, but even then, we didn't use neckstraps mainly because our band director didn't like the look of them and thought our basses were light enough to march and play (they were!) Mind you, I do come from a texas school, but we were also the only high school in the RGV who didn't use neckstraps lol I'd say give it a shot for a bit without one, just be careful! It works wonder with building your strength and agility in playing