That is why I asked the question about a selectable systems on the HX50 when it is marketed as a VFR machine that most owners will never take into snow or operate in very low temperatures.
Engine designs with a static front compressor support without the convenience of integral heating are all effected.
i.e every MD500 and Bell 206 and 206L ever built plus the Robinson R66 all have selectable engine anti-ice installed.
The limitations are roughly < 5C and moisture visible - you don't need to be in the moisture, just if you can see any.
I would guess that is a very common scenario in the UK and elsewhere.
Looking at the Hill engine design and the way the compressor is supported I don't see how it would be any different.
VFR certification has no influence.