I don't see a problem.
20 minutes is a long time, and you'd most likely find a way into other islands as I'm almost certain that all teams would have built a bridge by that time. You may think it is OP only because it gets you to a certain area almost instantly. Though I see this as a time saver, as you don't need to bridge all the way across.
After all, you get some games that don't even last 10 minutes. Then there's ones that last an hour or so, because all teams are on their islands mass protecting the egg.
Although the kit would be perfect for time saving/ against campers etc., I feel like it's unbalanced. By this I mean, in some cases the pearl would be a great advantage though in others it would be completely useless (e.g Pearling to an island with a fully geared team, you're most likely going to die before breaking through the obsidian - then wait another 20 minutes). I mean, I guess that's the point of the kit - you decide how to use it, but I'm still unsure of it.