Q180: I am on bail and I want to sign early/can't sign is that ok?
No it is not. The court or the police have imposed bail conditions and failure to comply with them will lead to your arrest. Signing early or late or not at all is a breach of bail and it is more than likely that you will be arrested and put before the next court.
If you want to change your bail conditions, you will have to speak to your solicitor who may go to court on your behalf.