Removing clip that’s securing rubber hose in washing machine

Go with your second approach of getting the right size fitting except don't bend the pipe, just deal with the angle. You pan lip should be higher than the ending (with fittings) top of the drain pipe so it can drain but that's all you need.

Why? PVC fumes are extremely toxic and you have a significantly better chance breaking the pipe than fixing the angle; then you'll have to tear up the floor to fix the pipe. A washer machine drain pan is used for worst case scenarios, not day-to-day use so as long as water can drain you'll be fine and a slight angle may actually decrease the minimum height of the drain anyways.

As for drilling the hole in the pan, mark it in place and drill it somewhere else with a sacrifice piece of wood/etc. underneath. You don't want to hold it up or anything because you'll need a decent amount of pressure to hold a bit in place and plastics like to fracture if not properly supported.

The humming is the drain pump, not the motor.

You probably have an electrical problem - some wire someplace is broken (probably a wire going to the motor, perhaps a sense wire, or for high speed power). I had this happen to me and diagnosis said to replace the main control board for $$$.

But before doing that I checked it closely and found a cracked solder join (i.e. one wire was not making a good connect). I reflowed the solder and all was well.

But I did this myself - and it took a long time. For you to pay someone to check this for you will probably cost more than just getting someone who does this for a living to just diagnose and fix it.

Unless you are really good friends with someone handy? Usually if you take apart the machine it will have documentation telling you how to diagnose it.

First thing to do after following the instructions on the documentation is carefully check each wire going to the motor, and check the board where the wire goes for a loose connection.