Well, I'm testing it out right now if you want.
Part of the concern is that you'll need to do things differently on different turns, so the PPP will be out-of-date.
For example:
Turn 97, 1575 BC wk Fish + Clam (which was the main point of your change)
Turn 99, 1525 BC You can still build the Monument but the "wk Fish + Clam" comment no longer applies since we are already at City Size 3
Turn 102, 1450 BC no change
Turn 103, 1425 BC no change
Turn 105, 1350 BC wk Coast at city size 4 (used to be nothing)
Turn 106, 1325 BC do nothing (used to be wk Coast at city size 4)
Turn 109, 1275 BC 2pop lib; wk Fish + Clam + Gold at city size 3 (instead of doing this stuff on Turn 110)
Turn 111, 1225 BC hire sci1 (instead of doing so on Turn 112)
It definitely looks like a better approach, though, since by Turn 106, you're only 1 Commerce and 3 Hammers behind while being up 7 Food.
That extra Food may come and bite us in the butt later, though, when we grow into an extra turn of Unhappiness twice (i.e. 2 extra turns of Unhappiness).