If a unit can be reversed it is automatically disallowed for RHI. That results in mainstream suppliers not supplying them. For those able to do so, the solution might be to source their unit from a country where they do not have similar market deforming incentives.
When choosing a country/location aim for one with a similar climate to ours and preferably for which you speak the language.
If you only speak English then you are limited to Ireland or dealing with someone who has English as a second (or third) language in The Netherlands or Denmark. Germany doesn’t have sufficient maritime climate zone and most of France is too temperate.
I haven’t looked into those options as I am fluent in Norwegian and intend to explore that market. The southern Norwegian coastal climate is not that different from ours. Second choice would be Ireland or Denmark for languages I understand. My Dutch was never good and I haven’t used it for over 25 years. I haven’t used German seriously since leaving school 46 years ago, other than ordering cake in a café.