Hmmm... tricky one.
Greg's suggestion on MIA-LIM doesn't really help since MIA-LIM is within one mile of MIA-UIO-LIM.
I'm also curious as to which OW airline flies NRT-ICN?
What about TPE as the starting point? The published fare for MGLOB34 is about US$230 cheaper than the Korean fare.
tpe-hkg-fco-bcn-mad-mia-uio-lim-scl-ipc-ppt-akl-nan-syd-ayq-cns-hkg-tpe
is 32972 miles. You ought to be able to get a ICN-TPE-ICN for more or less the same as the saving in GLOB price.