Oh, nice that makes sense. So it is definitely possible with access to the zone file.

Which I don't have access to since I only have a basic plan, and I don't think it's possible via the Advanced DNS Zone Editor either (I can only use the Basic DNS Zone Editor currently). Thanks for looking into this!

Nah, the advanced one doesn't let you do NS records either. You're welcome an account on my hosting though, and I'll create your NS records.