Creating schematics in SolidWorks is not the easiest task. I am not aware of any 2D blocks that might be out there to assist with this task. However, that doesn’t mean that they don’t exist.
If you do a lot of electrical work (schematics, layout, etc.) you might want to look into SolidWorks Electrical and/or SolidWorks PCB. They do have the ability to create schematics much easier and these softwares provide many other advantages (parametric with 3D, wire lengths, etc.)
If you don’t do a lot of electrical work and the only thing you use AutoCAD for is a few schematics, I would highly suggest that you look into DraftSight. It is a 2D drafting package that SolidWorks makes available. Here is a link to their website: https://www.3ds.com/products-services/draftsight-cad-software/offerings/ There is a free version as well as a paid version. But I have used the free version and did not run into any limitations. Just a thought.
As far as PDM goes, it does control DXF/DWG format files without issue too.