Epoxy may not have chemical bond to ABS. It doesn’t adhere to PC neither
Using ester resins (vinylester, polyester) could be better/faster. I would even use vinylester becuase it’s much much easier to work with.
The styrene (solvent) in those ester resins will soften/melt the ABS/PC on th surface and you can get 1-1 bond in terms of strenght, but that is when you have geltime (liquid state of resin) like 2 hours or more
PE/PP are inert and you need really special 3M stuff to bond something to it
You can always jep roughen up the surface (for good mechanical,not chemical, bond) and once you have the composite cured you can rivet all the edges with some nice plastic black rivets