To heighten the sentence's sense of levity, you could use the alternate: I had reasoned that thus ly I might alight upon a better opportunity. The other sentence is not a good candidate for the alternate.
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AnonymousThank you!Are you certain that you want this statement to be light-hearted and jocular?
pravuThe second one is ruled out because you reasoned first, then "thus" came to existence.I assume that it is a sentence taken out of some context. The second sentence is perfectly fine beginning with "thus."