Tymlos pens - can you still take a smaller dose?

I am about to start Tymlos, and the pharmacist from the specialty pharmacy told me that the pen only has two settings - 0 mg and 80 mg. and it doesn't click in between. Though he admits he only has touched a tester pen and obviously, the materials from the manufacturer don't explain how to get a smaller dose.

I really want to try a smaller dose at first cause I have a heart condition and am very worried about side effects. Is there anyone out there who is currently doing a reduced dose of Tymlos? I plan to try to titrate up, and understand this may not be an exact science, but would love any advice.

Thanks for any input.