@MargaretMcM Samsung may not take it on Board, but may depend on Feedback. It may not be the solution you are, looking but Scottish Gaelic is available via Alternative Keyboards such as this one.
However note that there are some risks wiith using 3rd Party keyboards and I have not used this particular app myself.
A bit of effort may make sense from a PR point of view, there is interest as many languages as possible. Whilst I live in Scotland imagine very few know much Gaelic in central belt mind you.