I wish to be the Executive Manager and Protector. I wish to be the main signatory. Will this work?

No, a protector cannot be related to an executive manager or trustees or beneficiaries.  If you wish to be main signatory, you need to be one of the trustees, and choose someone else as a protector.  You cannot be both a trustee and a protector.  A protector can only fire and hire trustees, only upon good cause, such as fiduciary malfeasance.  A protector cannot be signatory on the bank account.  So, if you wish to be main signatory, assign a trustee role to yourself.  Select a nominee grantor and someone else as protector, and you can be a trustee with a co-trustee or successor trustee, as long as you are not the sole beneficiary.