I agree with crabbygal902. That's a lot of traveling just to eat breakfast. Have you considered doing this on an MK day? Or, as crabbygal902, suggested, doing Tusker House this day instead?
If not, yes, bus to MK, boat or monorail to Poly, bus from Poly to AK. Just a note, it once took us 90 minutes to get from BC to MK to CR for an ADR. After that experience, we now take cabs if we are going from resort to resort. You may want to consider uber from POR to Poly. It would be much quicker.