You will do a CPL skill test. The fATPL is just a shorthand for CPL+IR+ME+MCC with ATPL written passes. You'll still be doing a CPL and will have to pass (at-least) two skill tests: CPL, and ME/IR.
Conversion to ATPL is years in the future, don't worry about it for now.
I'm unaware of any requirement to record numbers of take-offs and landings in EASAland, that's an FAA requirement. Don't worry about it. I have EASA and FAA licences, but started with UK CAA. I've never recorded numbers of take-offs and landings, except occasionally in notes where it was relevant to the 90 day rule. It's never caused a problem.
If you want to transfer everything to a new logbook all written in English go ahead. Doesn't really matter, but may make life easier. No need to get it certified for your old flying - just make sure your old logbook is available as the definitive document if anybody needs to see it. Equally your current logbook should be fine, just be prepared to deal with requests to translate entries.