I can empathy with current generation of audiophiles as not everyone has the technical know how or the time to DIY, so buying branded HIFI is ok as along as put in effort to optimize the sound, anyway music is just a hobby....
With internet, now you can view what other people experiment in other country like diyAudio web has a lot of interesting audio idea to DIY, so don't be constraint to Singapore web site only. I believe if you have try out some good DIY idea and the solution is good and really work well in the system, some users will want to try it and so I hope the information on this site will allow them to experiment it and share their finding.
Example, this power condition staff were not value few years back, but now I see more people paying great attention to clean up their power supply to get the best sound. So the low pass filter you suggest may work for a lot of system, I plan to order a few powered iron core to try out myself...built a few prototype to try out... But I feel if you can design a AC -regeneration power condition is still the way to go...if you have any idea of circuit, please do share it here... I will explore this concept and share if I come across circuit that may work and just try DIY it.