Surely some US institution is storing the standard foot (of length) in a vault somewhere?
Seems like (what was) the standard metre is still in . It's not needed since 1960, so if wants to take it (?) and split it in 3.28084 for their weird system, they're welcome.
No need, the foot is by definition exactly 0.3048 meter. The weird US units are just derived units of the metric system nowadays.