I could say the answer for your airfield would be MLS, which would provide precision track guidance for curved or offset approaches, the problem being few systems in europe are operational enough for an evaluation (most bizjets carry 'multi-mode receivers' capable of receiving MLS signals though).
My airfield did install and evaluate TLS, which would be able to replicate your 'dogleg' appraoch; it wouldn't have worked out too expensive and the US Dof D were willing to 'chip-in' if it was installed.
Drawbacks were as it needs a unique transpoder code, it will only handle one aircraft at a time; you will then need the first aircraft to either go to standby or input a new code in the receiver before it will give info to the second. Another drawback was the transmitted signal was very weak compared to ILS on the same frequency. Also the CAA said it could take 'up to' 5 years to evaluate it before they would approve it!
At the moment, I think you'll find GPS is a non-starter, (but watch this space) until there is good enough LAAS coverage due to the fact the signals are very weak, and tend to attenuate as you get lower due to satellites getting closer to the horizon as the aircraft descends; all other systems mean the aircraft is approaching the transmitter thus the signal should get stronger the lower you are.