I don´t know which hat are you talking about, but now with the Brexit it´s hard to send equipments for service/repair in England.
I was lucky to send/receive my CDX2 just the last days, very good service by Naim.
But then a found a NDX2 laying around somewhere…
Didn’t think you could connect a super cap to and CDX2……so I just have an XPS2 into my cDX2.
AFAIK, you cannot…
The CDX2 can be self-powered, or powered by an XPS2 - or a 555PS.
AFAIK… 
I ment CDX2-282-SupercapDR-300DR vs NDX2-282-SupercapDR-300DR.
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