1. Your flying training school will assess what training you need based upon how well they think you're doing - there is no mandatory list of specific requirements. I would certainly require someone in your situation to do some revision navigation training.
2. If you haven't used your FRTOL in the last 10 years, you WILL need to do the RTF theory exam and the practical test. Yes- that IS in LASORS. But if, for example, you've been using the RT as a co-pilot and can produce log book evidence to prove it, then you won't.
3. When the instructors think you're ready, you'll have to take the SEP Class Rating renewal proficiency check, NOT the whole PPL Skill Test. The Examiner will then explain the administrative procedure needed.