I think, if I am reading this right. The issue you have is light of dawn is not casting when you have three charges correct? You just continue to cast flash of light? I saw you have multiple posts about this issue.
There is no way to stop the cast of flash of light as you are wanting, but just using the spells you have this may work for you. It will not stop casting flash of light, but it will try to cast light of dawn before it tries to cast flash of light.
Of course there are no other holy power builders in this little macro I threw together for you, I just used the spells you had listed.
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IZZI_HELPS
Talents: 1222131
This macro contains 1 macro template. This Sequence was exported from GSE 3.0.70.