Perhaps a question more applicable to the most likely UK-based SR22 pilot/renter would be whether one can legally do an NDB/DME IAP, especially one on which DME is mandatory, (other than in VMC with a safety pilot) without an ADF and without a DME.
I think the answer is you go somewhere with an ILS.....
Its a shame that GPS overlays are not official and published for these procedures in the UK as they are in Germany and the US.
Ian