Why not? What do you think would happen?
If you think you would break something, you are simply wrong.
Actually, it is you who is wrong. In first gear the load is very small, nearly like revving it to the moon in neutral. As alluded previously by another member, the engine can(and will) rev freely beyond the rev limiter rpm under such conditions of very fast wind-up speed...sort of like missing a shift. The rev limiter may not save the engine, or maybe it will. You are taking your chances.
I believe that due to your lack of experience, you think rev limiters prevent engine damage, and this is not so. In fact, even riding on the rev limiter frequently can cause engine damage by the upset the limiter creates when it actuates.
While this isn't an answer to your 7000 rpm question, and I cannot answer that question because I ride an Enfield single, it may help you to understand that reaching the top rpms is best done in the higher gears, and not first gear, due to the wind-up speed.
Good luck on your question about 7000 rpm hesitation. Maybe shifting it at 7000 or lower might even be a good idea, unless you are a professional Enfield drag racer for money.