Hi Menic,
I have this problem, as well. What I do is apply a matte orange product to everywhere that has that blue/green tint after shaving; as long as you use something orange or red over the blue/green area, the colours will cancel each other out and you won't look like you have facial hair. I have just been using an orange eyeshadow from No 7. After I cover those areas, I blend it a bit at the edges, then apply Dermablend over it. I use Dermablend (the Fluid Corrective Foundation) as my all-over foundation, so I just try to make sure the orange areas don't show through--and Dermablend usually works perfectly for covering things up, so you shouldn't need any additional concealers for your facial hair unless you are using a different foundation on the area you've covered up with something orange/red. I know many people use Mac's Morange lipstick as their orange/red product. Just make sure you use a product that is matte and that will last for a few hours.
There are many great tutorials about this on YouTube and elsewhere.