I think 135.385 is for planning purposes only, just like planning for an alternate. Once you take off, if for some reason you can't land within 60% or 80% it doesn't really matter, AS LONG AS YOU DON'T VIOLATE YOUR AFM and you remain safe.
It says "No airplane may take off". It doesn't say "no airplane may land". It is just for planning purposes. Once you are airborne the 60% or 80% rule have no affect any more. If the wind changes slightly or that runway because closed, you can land on any runway that your AFM says is legal and safe.
To further see how it's for planning it states "the following is assumed, bla, bla." For planning you have to assume certain criteria. Why wouldn't they just say use the actual. But once you get there if the wind changes by 1 kt, or even that runway becomes closed and there is another runway that is 10 feet shorter but that puts you 1% under the 60% or 80% you can still legally land.
It's all planning purposes only. Read the reg "no airplane shall take off". It didn't say no airplane shall land. And if you still have ambiguity it even says if you don't have your 60% planned, go ahead and take off anyway.
Quote from the 8900 manual "A flight may be dispatched which cannot meet the 60 percent runway requirement at the destination if an alternate airport is designated where the flight can land within the distance specified for an alternate airport." See how it uses the word "dispatched" and not "land". Just planning.
If you take off planning to land within 60% or 80% and factors change and now its 59% or 79%, you are still legal to land if it is in accordance with your AFM. It's legal but it may not be safe though!