Given that you sometimes ride a SS, I'll predict that the larger gaps (on some range of the cassette) will give you little difficulty. Most SS and fixed riders have learned to spin at different cadences.
For gravel riding/racing, the top end is less important, since you'll likely only hit >25mph on descents...And those are great for recovery (i.e., tuck and coast) and/or are often rough enough that you wouldn't want to go too fast anyway.