Hi! If you would like to submit ORIGINAL CC0 licenced translations, you can do using the SuttaCentral Bilara app. This is used by all translators working on SuttaCentral, as explained in this thread …
We can’t accept what you have posted above… it would need to be submitted directly by the original author.
Thank you for this offer, and in accord with what others have said, it appears that the copyright is unfortunately too restrictive for SuttaCentral. It only gives rights to share the ebook without making changes. For SuttaCentral, we need to be able to reformat the content (for example, putting it in HTML, and removing footnotes and other extra matter.)
Are you aware that there is an earlier translation of the Ānāpānakathā by Ñānamoli in his BPS booklet, Mindfulness of Breathing? It’s much more readable than his later translation in The Path of Discrimination (on which Geoff Shatz’s work is based).
I believe the BPS would be likely to consent to the use that you propose, for they not only host the full text on their own site but have also allowed it to be uploaded to several others.