The video below shows how to create a tool for the QGIS Processing Toolbox that can run a dynamic PCRaster model with inputs from a dialog.
Note that you need to save the PCRaster dynamic model in C:\OSGeo4W\apps\Python39\Lib so it can be imported in a script. The processing script has to be saved in your profile folder, e.g. C:\Users\username\AppData\Roaming\QGIS\QGIS3\profiles\ProfileName\processing\scripts.