Originally Posted by
Fl1ingfrog
FCL 810
Applicants shall have completed a training course within a period of up to 6 months at a DTO or at an ATO to exercise the privileges of an LAPL or a PPL for aeroplanes, .....
And there lies the problem. EASA's anxiety in being anti-American and anywhere else in the world, they are specific in requiring that the whole training is conducted at a EASA ATO/DTO. Night doesn't exist outside of the EU., the rest of the world is bathed continuously in sunlight of course.
The UK CAA is no longer bound by such nonsense. However, it will be some time before these things will be resolved. You could try asking the CAA in writing (email) for current liberated clarity. At the speed they deal with these matters you could be well into the summer before a decision is given. You are not looking to "convert" a USA 'Night Rating' (as you state in your question) because you do not have one. You would be asking for your US training to be credited in whole or in part.
Why the assumption that the OP is trapped on fragile rock and subject to the UKs slide into the dark ages....... His question was specifically around an EASA licence unless I missed something?