Its a bit like road testing a car but never leaving the driveway.

Sure you'll get an idea of what its like to have something on your head, much the same as wearing a hat.
But as a taster to what wearing would be like, in my opinion, it doesn't really work.
A system bonded to the scalp is completely different.
It becomes a part of you and you can't tell its there.
It feels secure.
This in itself helps you to start forgetting about the fact you're wearing at all.
Besides that, its easier to blend and style when its bonded.

Its always possible to grow your hair again under the system.

But if you were determined to try without shaving, then you can use clips, sewn to the system base which clip on to your natural hair.
Over time, these clips can weaken your natural hair and therefore increase the area of thinning.

I used concealers for far too long and the day I left them and the mess behind to start wearing was the best decision I ever made.
I spend a fraction of the time maintaining my system than I used to do using sprays & concealers.
The result is 1000 times better and I don't have to worry about lighting, pillow cases or rain!

Good luck.