I totally agree with Paul.
I know that your template area looks like only a few millimetres bigger, but you would be surprised what a HUGE difference it would make to your appearance.
To lower your hairline to that extent with the sides & temples being not as thick as they could be, could look VERY noticeable and unbalanced.
The more of your own hair you can incorporate, the easier you are making it on yourself to wear.
You are luckier than many wearers because you have a relatively dense area right at the front of your hairline.
Getting & exposing a convincing hairline with a piece is possible, but also one of the most time consuming aspects of wearing.
You could avoid all that by using Paul's suggestion of having a lace front BEHIND that thatch of hair.
If its still not the look you want, you could always progress to a lower hairline in the future.