I checked the license used by MusterTicketPlugin. It is similar to Trac license (modified BSD license). So here there is no big difference between candidates here.
In both cases, a lot of changes should be made and I do believe that is very desired to have BH source in single repository to avoid version incompatibility and other headache connected with supporting two different source codebases. If there is no objections, I will start with prototyping on trunk by creating a new plugin bloodhound_ticket_links (enabled for dev installation only) and at the end of prototype phase we can judge what candidate to use. Regards, Andrej
