is it possible to put custom symbols by modifying the existent or creating them on the master palette?

I want to put my own handwritten symbols on my MuseScore scores (they are like my personal stamp when it comes to handwritten scores).

Is there a possible way?, do I rely on the master palette?, does it have to be done with the Musescore API (I'll be able to develop a plugin for this) or can it be achieved natively through the format and style settings?

I'll be looking forward to it 🙂

PD: I tried it by importing .svg images to it... with... results...
(see image below)