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If you listen to the Dubliners' song 'Muirsheen Durkin', you will hear precisely that pronunciation... (and it's a good song too, about Irish immigration in the nineteenth century: admittedly later than the seventeenth century).

A quick research through chat gpt (sorry). 1600s had irregular rhyme schemes and punctuation wasn't standardized, yet. Most likely, the colon was used for a longer pause before going into description. The rhyming scheme was: A B C C