*UPDATE*
I found a solution: "amdmsrtweaker" . This very basic piece of software is able to modify VCore & Ratios through a simple command line, that can be placed into a batch file for instance. Works great ! With some clever BIOS managing you could even let it dynamically boost both Ratio & VCore depending on application needs, very similar to AMD's Turbo Boost feature.
For now, I have simply created a batch file executed during each boot to set clocks to 2.1Ghz @ 0.9VCore (still have to see if I can lower that a bit more). Another batch file I simply need to click and run to instantly boost to my 4.67Ghz overclock on all cores.
Furthermore, in BIOS I have set my 4.67Ghz OC profile active. This means that I get razor-fast boot times, once booted it drops again to 2.1Ghz due to the batch file, which is more than enough for browsing, email, downloading, watching movies, etc etc. If need, all I need to do is click the other batch file and presto: full power again !
This is going to extend my CPU's lifetime significantly AND keeps the room from heating up HAHA 😄