The only thing I can think of is the 34-43 respec trial. And you always have the 44-50 as an alternate option for that.
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Meh. I recommend just going with level 25s (or 30s for sets that start at 30). Apparently the enhancement difference between 25 and 40 is rather miniscule, and then you can keep your bonuses all the way down to 22 (or 27).
I checked Ouroboros and did a brief search on ParagonWiki, but thought I'd make a final check. Does anyone know of any of the 40-50 story arcs or Task/Strike Forces that exemplar you below 45? I'm planning a build where I want to keep the bonuses for any content above 40, so I'm trying to figure out the highest IO level I can go.
Thanks!