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No metal in the jamb
Well, it turns out enlarging the opening was easier than I thought it was going to be. The opening the cable passes through from outside to inside only involves the plastic jamb. I drilled several very small holes to weaken the area above the opening, then used a utility knife to cut that area out, enlarging the opening upward. Easy enough.
But it makes me wonder whether my theory is accurate about the fraying being a result of the cables rubbing against the opening. Made sense when I thought the opening had metal edges. Could that somewhat soft plastic really cause damage to the cable?
If not, then I have no idea what could have damaged the two previous cables. . . .
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