Hi Luc
Yes, it will work and actually that's what the scoring blade does (see pic)
In any case, you must set the blade low (~3/64) and you shall have to "Flip" the blade again for the main cut...otherwise you shall have a lot of smoke it the shop...
Your idea is good if you have to cut many boards to the same width; you score all of them, "flip" the blade to "normal" and cut all of them.
niki
Scoring blade.jpg