Under a View Legal constitution, if there is at least one remaining director, that person can exercise their power under the constitution to appoint a replacement director (being the legal personal representative of the incapacitated director).
If the incapacitated director was the sole director, then the shareholders would need to pass a resolution to appoint the new director, again being the incapacitated director’s legal personal representative. If the incapacitated person was a shareholder of the trustee company, their attorneys would vote on their behalf in appointing the replacement director pursuant to the enduring power of attorney.