Why is it that, for so many people, someone cannot possibly be an instructor and still have a longer term aim of commercial flying?
I got an FI to progress because the other options certainly didn't fit my aim. Instructing was the best fun flying I ever had and the job itself was very rewarding. It also got me my first commercial job and started my career in aviation proper.
Go for the instructors job, understand your responsibility therein and have a great time.
The industry is set up for that progression, and until schools change and students want to pay more for their training, ever it will be.
Good luck.