Help Need Please as bottom Crank Bearing Damage

Hi All. I have a 2014 Honda Grom with the Finbro 183 big bore kit and I'm Living in Thailand and not easy getting part here as I will have to get them shipped out from the USA. What has happen is the bottom crank bearing was missing when the local thai Mechanic has pulled it apart and everything else look ok to my small knowledge about motor. so my question can someone point me in the right direction to were to get the parts from in the USA and what parts should I replace like ( all bearing?) and can I just buy the bottom crank shaft bearing? also should I replace the piston and rings why the motor is open. Also the only thing that does concern me a little bit there is a few small in bents in the top of the head (see photo) and will this need replacing as well but the cylinder bore looks ok. So if any one can point me in the right direction it would be much appreciated as I Love riding my Groms in Thailand
P.S I have 3 small bikes lol