I think it is great that you are publishing this initially as an “alpha”. I think it is a first for the Ontario government and definitely an example of modelling the behaviour that you want to see in others.
You mention that before the alpha stage, you consulted with key policy experts and practitioners from the various Ontario.ca teams but didn’t hear much back about the barriers. I think that the Ontario.ca team in Cabinet Office is pretty privileged in the OPS and may not face the same barriers that ministry practitioner teams face. I expect (and hope) that you will get more useful information in this area now that the alpha is being shared more widely for implementation in line ministries.