Hi. IANAA but here is my understanding of GNU/GPL.
Anyone can release software under GNU/GPL. As long as your scripts are your work, and are separate from the commercial software, you can apply any appropriate license.
The gnu.org site has a list of various licenses
here. Also, there is a GNU/GPL FAQ
here, and the GNU/GPL is
here.
Even though software may be GNU/GPL, the software is not necessarily a GNU package, but software need not be in order to apply GNU/GPL.
GNU/GPL software as of Version 2 does not limit the removal of links, code modifications, etcetera. It is the copyright that is not to be deleted.
The selling of GNU/GPL software is permitted, even if the seller is not the origianl author. Basically the premise behind GNU/GPL is free to do rather than $0.00 free.
If you want to release under GNU/GPL, then you just do, no approval needed.