Option 4.
If we're going with option 1, I think the CRD bit should be covered by the rules (instead of by a card entry). Something like:
If one side of a skirmish is resolving using an attribute other than strength, determine the winning side and whether the losing side is overwhelmed solely by comparing attribute values, following the procedure [outlined in the rulebook]. Ignore any effect that would change this outcome, except for effects that increase or decrease the value used by that side.
As mentioned, I don't believe a "normal" resolution follows this ruling (
TTotGR works without reference to strength;
Coat of Mail works just fine even though it doesn't increase or decrease strength), but it seems to be what the CRD is saying.
I'm also assuming that the line "As a result, none of the cards that previously had an effect on strength during a skirmish have any effect on a skirmish in which this card is played" refers only to the skirmish
resolution.