The aid has been in use until fairly recently, so there shouldn't be any problems with freqency.
There won't be any 'unofficial' instrument approaches of any kind. I may knock up a holding pattern to use with my students, but it would only be used in VMC and by myself just to allow a bit more freedom to practise.
Relying on any aid that hasn't been properly certificated is an idiotic idea in IMC, but I've seen many people using 'unofficial' GPS approaches in all sorts of conditions. Needless to say they have had a damn good kicking when I've caught up with them. So don't worry about the aid being used for any dodgy purpose!