First , there is a huge difference between "crime scene" and "forensics." Related and intertwined but two distinct animals in the law enforcement world. And while you may not care, the first defense attorney you come across will!
Forget the patch or insignia......you are putting the cart in front of the horse and it should not be part of any presentation. Its like an applicant asking "what brand of handcuffs do you use" or "what brand OC spray do you carry" at an interview. Lost in the weeds crap.
If you don't have a unit, the focus and every penny spent should be on training, certifications and equipment, and how that will make you agency better and cases easier to prosecute and increase convictions. Patches, shirts, etc.... are all crap for discussion once the unit is trained, certified and operating.