In the presented situation, are you allowed to pull over by the kerb before the sign?

Why?

The B-36 sign with the T-25c downward arrow marks where the stopping restriction ends. The section before the sign is still covered by the restriction. You therefore cannot stop at the kerb before this sign, even briefly.

§ 28 ust. 2 i ust. 7 pkt 3 rozporządzenia w sprawie znaków i sygnałów drogowych