If the material is "tweedy" enough, I've toyed with the idea of ignoring the placement of second/lowest buttonhole and cutting right through it, if needed to create the most pleasing curve. Then pick out the buttonhole threads, perhaps iron a bit of interfacing to the wrong side to reinforce what's left of the buttonhole slit, maybe use some matching thread to close up the slit if there is a lot of it remaining on the front of the jacket. Then go ahead with the conversion, pretending that little slit no longer exists.
Haven't tried it, so no guarantees. But the hairy-er the fabric, the less likely anybody will notice that little mend vs. them noticing an awkward "curve" forced by your need to dodge the buttonhole entirely.
It's on my list to try this. . . don't hold your breath, it's a ways down a long list.
Proudly Duncan [maternal], MacDonald and MacDaniel [paternal].
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