You’ve mentioned that you want to get into HEMS/Police etc and that’s a commendable route. But I think you’ve already hit the nail on the head with regard to offshore experience.
As boring as offshore is it has plenty of benefits. You’ll accrue ME & MP time quickly. You’ll have the hours for an ATPL after about 2 years but most importantly it provides a safe & structured environment for you to learn the basics. You’ll come away a very good IF pilot which will serve you for the rest of your career and the training structure will teach you a lot that you can also take forward.
LZ