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If the cabin has low voltage DC, that makes it easy as you can wire up anything yourself, legally. (If it uses 240VAC for lighting, you're limited to certified products and need an electrician to do the wiring).
What you do depends on whether you want to protect unaided night vision or eliminate photographic effects.
For the former, try external shutters on the cabin windows.
For the latter, you could try selecting specific wavelengths of LEDs (I've seen plenty on Alibaba) and get a local electronics shop to solder them onto a backplane/project board/diffuser, and wire them up for you with a bias circuit (if you don't want to do it yourself).
Pick the LED wavelengths to fall into the blocked portions of your light pollution filters or simply outside the bands of your narrowband filters if that's all you're using.
I've been thinking about a project like this for some time - to try and produce astro-friendly LED street lighting - assuming we use light pollution filters in our back yards.
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