Sorry, but your history is wrong.
The English did not conquer Scotland. Nor was Scottish banned. Scots was and is the dialect of the south of Scotland, and the south of Scotland almost en masse opposed the Jacobite uprisings of 1715 and 1745. And Scots is a dialect of English, not a language and as a dialect of English, its therefore not Celtic.
Gaelic WAS banned in the Highlands after the last uprising, but your dates are well out. The ban came from 1746 onwards, not the late 1800’s.
Thank you for the correction.