If you don't have CPL exam passes, you can only teach LAPL. I don't know of any schools in my area that are able to teach LAPL at the moment, because we are all still RFs. Even when we become an ATO later this year (I hope), I don't think that there will be very much demand for it, other than for a few people with medical issues. Anyone hoping for work as an FI without CPL knowledge is likely to disappointed. Why would a school take on an FI that could not teach PPL?
There may be more opportunities for microlight instructors though.