I don't understand why you think it's unrelated, though. What you do has an immediate bearing on how easy it will be to settle in a rural island setting. If you are a teacher, mechanic, plumber, electrician, or cook, for example, there will probably be work for you. If you are a personal stylist, or a nightclub promoter, or work in corporate PR, it might be more difficult. Obviously that has an impact on how viable your plans are.
I did want to say something about SEN and moving to the islands though. You're not alone in thinking of it as an option, but as @sunshine244 points out, you're proposing something which might cut you all off from sources of support. Potentially you'll be in a situation where there won't just be less available, but none at all, and tiny rural schools and island infrastructure are not equipped to put in place the kinds of interventions and help that you might have access to elsewhere; the teacher pupil ratios, the availability of staff, and the degree to which all the staff are already stretched beyond realistic expectations can mean that it's simply not possible to help pupils with additional needs in the way that you would hope. The same is true outside the school system; there may be other homeschoolers, but the infrastructure around them is much more limited than you would be able to access in more populated places.
In the islands that I'm connected to, there's been an influx over recent years of families who have had a really difficult time with kids with additional needs and think that more space and being in the countryside will improve things. For many of them it has been a bad move, for all the reasons we've been talking about. But they have also had a significant impact on the communities and schools they have moved to, not because of any bad intent or lack of good will on anyone's part, but because it's so difficult for tiny schools to meet their needs and absorb the challenges they bring. Think about it proportionally - in a city primary with a few hundred pupils, the impact of one new student with additional needs can be balanced because there will already be a range of support workers and teaching assistants in place, possibly a specialist teacher or two on the staff or visiting regularly, and experience in the school of how to meet varied needs across year groups. In a school of 40 kids, with two mixed age group classes, no additional support and the head teacher in class for four days a week, there simply isn't the capacity to cope. Highland Council and Comhairle nan Eilean Siar have cut additional and SEN provision to the bone, and even when pupils are entitled to support workers they can't always supply them because of chronic staffing shortages - exacerbated, ironically, because of the rise of holiday and second home owners and incomers causes housing shortages and price inflation which mean that staff can't accept jobs because they can't find somewhere to live. Families with no extended support network can find it particularly difficult to cope in these situations, and the results can be pretty awful for everyone.