safe attempts ^^

safeContract.getTransactionHash(myToAddress,1000,NULL_HASH,0,0,0,0,NULL_ADDRESS,NULL_ADDRESS,0)
.then(
  (hashedTx) => {
    console.log("Hashed Tx:", hashedTx);
    let binHashedTx = ethers.utils.arrayify(hashedTx);
    console.log("binHashedTx:", binHashedTx);
    wallet.signMessage(binHashedTx)
    .then(
      (signature) => {
        console.log("signature:", signature);
        let splitSig = ethers.utils.splitSignature(signature);
        console.log("split signature:", splitSig);

        // Add 4:
        console.log("finalSig:", signature.replace(/1b$/,"1f").replace(/1c$/,"20"));
        
        // Output:
        
       //   signature: 0x8144a24b5e28e8b383287146c4f263172e2f5ca55d84e3ea6dcd5e166770b4944277fd325e907eef33ea4a43b57c56646945624fba4b7f3027e81ae2f815c4a31c
       //   split signature: {
       //     r: '0x8144a24b5e28e8b383287146c4f263172e2f5ca55d84e3ea6dcd5e166770b494',
       //     s: '0x4277fd325e907eef33ea4a43b57c56646945624fba4b7f3027e81ae2f815c4a3',
       //     recoveryParam: 1,
       //     v: 28
       //   }
       //   finalSig: 0x8144a24b5e28e8b383287146c4f263172e2f5ca55d84e3ea6dcd5e166770b4944277fd325e907eef33ea4a43b57c56646945624fba4b7f3027e81ae2f815c4a320
        
      }
    )
  }
)