The QFR has a standard layout, it is not the case with some other CM models.

Then use a 75% or TKL. No one forcing you to use 60%.
I prefer separate esc and tilde keys without having to use fn.

Now theres a reason why grey and now black is the default colour.

The o-ring mod can only dampen the sound when bottoming out. Theres still noise from the rebound action where the stem hits the switch housing.
Theres thin o-rings which don't shorten the travel too much (or thicker ones which do), and hard o-rings which give a firmer feel at the bottom (or softer ones which give more of a rubber dome feel).

You can also make your own from cutting latex rubber bands/tubing from the hardware/aquarium shop thinly using a razer blade depending on whether the material is hard/soft enough for you.

I've got the keycool 87 from taobao.
You buy things through taobao from an agent. Find one from the classifieds subforum and get a quote. The first one tried to scam me by adding extra charges for shipping even though the taobao website said nationwide (China) shipping was free and his nick starts with "c".

Mkb is considered an electronic item and you will need to pay sensitive handling fee of RM25 on top of the normal fee. Agents will not take responsibility if items are lost/stolen during shipping(all of them, its in the terms of service) and the warranty is practically useless since you have to ship it to China for returns/repairs.