Take the risk
Although you see yourself as a niche teacher of textiles, you can teach across the DT curriculum. There more jobs for textilehome economics than just for textiles. Any extra you can add to your CV will help. You seem undecided between some extreme choices, so it may be that you are more interested in moving away from your present choice than to anything in particular. Narrow your choice to what you really want to do, then take the risk, since you are unhappy. When it comes to finding a new job, it will be the same kind of selling job you did when you found your present post, but with the advantages of more teaching experience and whatever you have chosen to do next year. If going abroad, applying for a new job is difficult until you return home, so take that into account. As to your lack of commitment, it depends on how you sell the experience. Schools want teachers who are positive and can explain why they did something, not just drifters.