I’d say you’re a Route 4 as you currently hold an EASA CPL, albeit with ATPL theoretical knowledge credits. Good luck.
Edited to add that although CAA refers to a ‘frozen ATPL’ I can’t find a conversion route. Whatever it says on your EASA licence (currently CPL) is what you will get from the CAA and then when you have the hours you can convert your CPL to ATPL.
Last edited by deltahotel; 26th Mar 2023 at 21:36.