It is your option mate! For me, if I feel I am well qualified to do the ROV job, I will step out to my current company. I can also work on the ROV competency to be promoted and go up to the next level of position.
If you will be promoted as Spervisor to your current job, it will not make a change when you enter the ROV industry. You will start as a Trainee then become a full pledge PT after you complete your competence. Nowadays, the company is aligning their ROV personnel competence (base on IMCA) for clients approval to go in the job. Your competence is your key to your profession in which the company/agency base your wages.
Time is gold as of now as season get busy.