You can ask that your employer issues a COS for a shorter period of time. Whether they do so is entirely up to them.
I hope this answers your questions. If so, kindly rate the answer and provide feedback.
If you have any further questions, please do not hesitate to ask.
It can be cancelled and reissued again.
No it should not. They should only issue you permission for the lesser period.
If you have any further questions, please do not hesitate to ask
Yes. Unless your employer can cancel and issue a new one.
Yes you can
No, that is not consider3d as deception. If in doubt, you should mention it in the additional information section of the form.
It should not be.
Ultimately, the home office make the decision. From my experience, I do not feel that it should.
I will then be happy to answer any follow up questions.