How to become a Primary Senco TeacherWatch this thread
You won't be able to jump straight into a SENCO role without QTS, some experience (at least get through your ECT first) and then you'll need the support/agreement of the school you are working at in order to complete the NASENCO. Doing a degree in a related area will be of benefit though if you wanted to become a SEN teacher as you'll be bringing something extra. There are also Primary PGCE with SEN specialism which also give you a greater depth of knowledge. There are also BEd/BA Primary Education courses with SEN specialisms too.
Would it be best to do an Education and Inclusivity course and then a PGCE in Primary Education to gain a QTS. Would that make me stand out more and more likely to be able to become a SENCo, or is it better to do Primary Education with QTS
If you know you really want to be a Primary teacher then I would suggest going for an undergraduate degree and getting going on becoming a good one. If you're unsure if you want to be a teacher then a degree in something you are interested in followed by a PGCE later once you are certain.