Well, you have a few different choices. Either you go through the necessary steps for an Unresponsive Profile Manager Request, so that you can get on the trusted list and be able to correct the LNAB. Sometimes a PM will respond to a trusted-list request, while they haven't responded to a comment about the LNAB correction on the profile. If so, that's all you need.
Or you can create a profile with the correct LNAB and initiate a merge. This isn't wrong, since a correction of the LNAB is technically a merge, anyway.
It all depends on the activity level and "responsiveness" of the PM, I'd say.