Hmm, doesn't the LGPL allow you to remove any additional restrictions?
> All other non-permissive additional terms are considered "further restrictions" within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term.
And the LGPLv3 incorporates the GPLv3 by reference, then grants additional permissions.