All the bike I've owned over the past 20 or so years, ridden several 100k km and travelled on world wide, as well as mainland Europe and UK, have had louder than standard pipes. On my triple (Triumph) and V Twins (old Af Twins and Transalp) they have had a certain roar  On 650 and 400 cc singles loud too. An old 250 single dirtbike that I commuted on in England had an very offensively loud pipe  .
I have never been stopped anywhere (UK or abroad) because of the pipe. Never really stopped for any reason by any plod. I also don't ride like a nutter. When travelling I try to avoid large urban areas: Less people, less cage drivers, less plod, more interesting scenery, roads and trails.
In the UK there have been so many police cuts, that you'll struggle to see any plod while riding. They seem to rely on cameras to catch people breaking "laws" on the road. I don't believe they record sound.
I think the OP is overthinking things too much. Leave the usual pipe on.
PS. If you want to park you bike in eastern Europe, I recommend Motocamp Bulgaria = Welcome to motosapiens.org | motosapiens.org
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