you could build a small vessel just slightly larger than the footprint of the skimmer and place it inline next to the sump (and slightly higher) so that it gets raw water first then overflows (to the sump, again).
Else your skimmer performance will be seriously handicapped IMO.
Or... sell the sump you have to someone that does not place an emphasis on skimming ( they do larger water changes, lower bio-load, etc) and rebuild your sump.
do it right the first time, mate... you have a lot of money, time and life forms invested in this tank.
Anthony
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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