No, that does not work. IP you create is currently governed by a contract with Company A. Signing a different contract with Company B will only make you more li

No, that does not work. IP you create is currently governed by a contract with Company A. Signing a different contract with Company B will only make you more liable as both contracts must be adhered to, and if they both claim all IP then the only valid move is to never create any IP. Get your current employer to approve your project through an addendum or find other employment, and in the future do not sign contracts you do not want to follow by the letter.