These is a nice switchplate surround that should be suitable for any standard single size plate (aprox. 2.75x4.5 inches), but you may be able to resize it using Bambu Studio or another tool. It would work well if your existing plate doesn't quite cover the opening.  This does not replace your switchplate, it is in addition to it.   Or you could use one of my switchplate designs with it.  You can find them in my Hardware Collection.   

The Unfortunately Necessary Disclaimer 

Important Safety Disclaimer for 3D Model:

PLEASE READ CAREFULLY BEFORE USING THIS 3D MODEL

This 3D model is provided "as is" and is intended for use as a design aid.

Limitations:

Key limitations of the 3D model include that its accuracy and scale are not guaranteed. If the model is of a functional part, it is not guaranteed to withstand mechanical, thermal, electrical, or chemical stress.

Safety of Printed Items:

Users who 3D print this model are responsible for testing and validating the printed item and selecting the correct material for its intended use. The creator is not liable for any issues resulting from the use of 3D-printed components made from the model. If printing small items, be mindful of choking hazards for children. All resulting items should be handled responsibly and according to applicable regulations. Be aware of potential hazards during post-processing and take necessary precautions like wearing gloves and eye protection. 

Disclaimer:

By using this model, you accept all risks. The creator disclaims liability for quality, performance, merchantability, and fitness for a particular purpose.