Don't worry too much about loss of accuracy, I believe that is in the mind more than in reality.
I too imported a H5A from Holland at a time when their availability here was in doubt. If you have never tried one, then let me say they are a lot of fun, and a joy to own.
Mine got sold on after about a year or so when various voices in this industry were insistent on poking their sticks into the sleeping lion's ear and trying to get the HO to make a firm decision about the legality, I suspect they wouldn't have minded a decision that banned them. Remember the HO had already given guidance that despite the anomaly that the wording of the Act had created, nobody would be prosecuted purely for possession.
The second reason for parting with mine was, in competition I could not separate the H5A's results from those of my modified S410. And I could take the S410 to Bisley and nobody would turn a hair, but I was reluctant to appear there with a rifle that some folk considered illegal to own.
Back to accuracy, here's a card shot at 20 yards standing, three consecutive magazines through the Steyr, that's fifteen shots in all.
https://i.imgur.com/3bYa2Vv.jpg