Redefine a library from SKILL?

I work in CAD support, so I find myself doing this a lot in cds.lib:

UNDEFINE someLib

DEFINE someLib /some/users/workarea/someLib

I was wondering if this can be done from SKILL without actually editing cds.lib.  E.g.,

ddUndefineLib("someLib")

ddCreateLib("someLib" "/some/users/workarea/someLib")

N.B. ddUndefineLib does not exist, and editing lib->readPath doesn't seem like it would work.