No. of Recommendations: 0
... 6 slices at a time, potentially up to 6x the trades?

I don't think that's a big worry.
There are only so many choices, and you only do the NET trades.
If one lookback is shifting from US equities to bonds and another is switching from non-US to US equities, there is no trade for the US equity holdings.
Plus, each trade would be 1/6 as big, so 6 times the trades isn't 6 times the cost, just 6 times the typing.
Assuming you're with a broker that charges in proportion to the actual execution costs, as mine does.

Jim
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