I am well-versed in the Office 365 environment and aware of font embedding - the question was in regards to Keynote and cross-compatibility.
In my actual use case, Keynote is a document format that I must accommodate along with MS Office for "corporate" use, not a personal/pet/student project. Not only do I have to accommodate Keynote and PowerPoint, the template must work across PC, Mac, iOS, and web environments, hence my question.
Thank you for the snarky, unhelpful reply - as this is a corporate request, I doubt it will "attenuate career growth" as you assume.