It shouldn’t matter if it’s a column or measure. Once it’s a measure it’s like a virtual calc regardless if it’s initially been calculated from a column or a measure that has many branched before it.
If you sub in the weighted average measure everywhere that I have place my ‘total sales’ it should still all work from my understanding.
What results are you getting when you attempt to do this?
The logic should all be exactly the same, you just need to sub out the total sales for your calc.
By the way that initial [Ranking] measure is the SELECTEDVALUE( RankingIndexColumn)