In the case of the cross of St George or St Andrew I personally like the square version in the canton, especially in the case of the Royal Banner, which I should say looks far better on a blue field. The white fimbriation around the shield looks good
The personnel flags are top notch too. I am unsure about displaying the full seal on the PM's flag though even though he is keeper of the Great Seal. What about taking the too main aspects of the seal which to me are the shield and crown on only using them?
I enjoyed your Northern Ireland idea, I think it would be a good idea because not only as you have mentioned do you have the legacy of the plantaion among the protestants, but the Gaelic Catholic culture would be similar to Highland culture.
it is not unusual to actually see N.Irish versions of the Scottish flag for example here you have the saltire and red hand/thistle logo of the Ulster-Scots Community Network. The Flag used by Ulster Nationalist (not to be confused with Irish Nationalists) use the Irish Saltire placed on top of the Scottish one (although without any fimbriation) with a red hand and star and the last one a saltire with an Ulster banner shield, which is not a flag of any organisation but rather the kind you can easily get in shops.
My idea of a Scottish NI flag was based on yours except defaced with a hexigon/red hand. Then I thought why not make an ensign like other Scottish territories, with the shield in fly and saltire in canton. But I took this further and made a flag based on the Ulster flag with a saltire in the canton, which for me all this was very amusing but I think we shouldn't get too carried away as this is about Scotland rather than NI
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