Not overly beneficial in terms of the skimmer already being sized well for your size of tank. An RC mod would ideally improve efficiency with increased contact time but this extra efficiency is not something you'll likely notice nor is the skimmer really designed for it in the first place.
Sealing the skimmer for external use will present two major causes for concern IMO, one being proper access for pump maintenance and the other relating to leaks from a variety of areas including skimmer cup overflow. Mods also hurt resale if this is a concern at all. The separate tank idea IMO is the best solution besides the new purchase of a sump or skimmer.
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