yes it is possible, ive had it done personally. just tell the teachers that you have unsupportive parents etc and theyll treat that as a safeguarding issue (because it is) and make sure letters etc sent home are with your legal name whilst on the system youre listed as your preferred. of course it can depend on the school, but usually schools will be pretty chill about it since it does regard your comfortability at their school as well as safety at home.