Dear Diana,I am sorry you did not end up with what you have expected. If you do not like the implant, and I agree with you that it made your chin look wider, then definitely you can remove it. The question remains what id best that suits you to replace it. Sliding Genioplasty might be an answer...
There is no need to remove the hardware (plates and screws) after facial reconstruction (genioplasty). The plates are only 1.5 mm thick and the screws are 5 to 7 mm. None of which should be palpable.
The reason your chin looks bigger or more ‘witchy’ is because the genioplasty pushed the bone forward. There are some non surgical ways with fillers to treat this but sometimes revision surgery is needed. Consider a consultation to discuss the details.