3on 3off - what's the job? It sounds perfect for modular flying. Can you work extra weeks or even make your regular job 9on 3 off? You could also consider agency work during your 3 off, or get a ground job with a flight school and work to fly which could be more tax efficient. It might also open up FI opportunities in the future.
You should certainly give it a shot. Get a Class 1 medical and a PPL then you can start on the ATPL study and the rest will fall into place.