Danish Civil Aviation Authority
 

Do you have EASA license?
(the 14 ATPL exams + EASA CPL IR/ME?)

Your TR can't be endorsed as you did not have an EASA license when you took it, also because of this you would not have been tested according to EASA standards to test certificate.
However if you have a EASA license already, and you make the test, than you can in advance request the trainer to assess you for both EASA and your current local license. But the trainer will have to send the report to this CAA. example Denmark in advance, and he would also need to apply in advance to Danish EASA to be able to do your license check / TR.

So I can assure you that you won't be able to use your already check made, just because they trainer was EASA approved.

You need to do the ATPL's before you can do the Sim license check / TR.

Hope it works out for you and good luck with the 14 theoretical exams. They are a nightmare so my humble suggestion is to start refreshing old memory as soon as possible if you plan on doing them! (this conversion is nothing like an FAA conversion, but you are probably aware of this.)

I had a friend of mine doing this a couple of years ago, with over 20 years flying in Asia, he wanted to convert back to EASA license. With over 15.000 hours experience Captain on 777, 747, A340, 330 with Cathay. He failed 2 of the exams, and never got around to take the remaining before they lapsed.
The issue is that they are not very relevant to normal operations these days, so they are a bit of a headache. I would recommend Bristol QB and make a plan how to do the exams, not to do all in one go, but make sure you have paced it so you have time to do retakes within the time limit if required.

We had a system where you did 3 exams after 2 months, 6 exams after another 2 - 2.5 months and remaining 5 exams after another 2 months, so a total of around 6 months.
The thinking behind this is that after you have completed all 14 exams, you still have another 12 months left for any retakes. You can retake any exam maximum an additional 2 times, within 18 months from your first passed exam.
Depending on your experience level, you might or might not need to take them trough a training facility. My friend with his experience could just do the exams directly with the CAA.
After completion he would have to do a Sim TR check / LPC.
I would say UK is better to do the exams, however UK is full of uncertainty because of Brexit, so you will to see what is possible.

Well unless you have a EASA license you will not get it endorsed as a EASA TR, as you lack the fundamental things for getting that.
That's a EASA IR / ME / CPL.

Regarding the ATPLs, it all depends your experience level. I can't recall the details my friend told me about that, but you would have to have few thousand hours P1 time for sure.

The ATPL's must be completed within 18 months of sitting your first exam (passing first exam), and you IR must be passed within a certain time limit after passing your last ATPL exam (you need to check EASA rules) from passing your final ATPL exam.

When you took your type rating, you did not have a EASA IR/ME, that's one of the main reasons you can't endorse a license that you don't have.
When you do LPC / TR exam, that also gives you your IR. You can only get a EASA IR if you have passed the 14 exams.

Regarding the ATPLs, if I was you I would contact Bristol Groundschool, I am pretty sure they are clued up of what to do in case of Brexit. And probably have some contingency regarding this.