I will also tag @NateWr, if we would like to follow these guidelines, or keep it the way we do it now, i.e. with “DOI:” ? – I do not know why one should not use it – I do not see the real meaning of the guidelines…
I think the point there is just not to use things like “DOI:10.1234/12345” which was the original guideline. Instead a full url should be used. (see DOI display guidelines - Crossref => “Why not use doi: or DOI:?”)
That said, I do not think that “DOI: https://doi.org/10.1234/12345” is a problem at least on the landing page. In APA case it is just a matter of following the updates of the guideline. I think that APA long had “DOI:10.1234/12345” format in the guideline.