How many amateurs are there who could make a long splice and re-reeve them with reasonable expedition?
Then take an overhand knot with the two ends, divide the yarns, and stick them as in a long splice.
This splice should only be used when there is not time to make the "long splice," as the short one is not very strong.
The strop may be made the required length by a long splice, but it would not possess any advantage.