Originally Posted by Iride01

Options 2 or 3 are the best, IMO.

If you repair the crank then take it to someone that knows how to properly insert helicoils. And it needs to be a left threaded helicoil. Some bike shops might not have experience with helicoils nor may they even have a left threaded tap. So if they have to buy the tools, then they'll probably charge you more. So try to find a shop that has done this before and since they'll probably still have the tools it won't cost as much... hopefully. Nor do you really want a noob installing your helicoil.

You might also find a local machine shop or job shop that has experience with helicoils, but they might be more unlikely to have a left threaded tap.

You might find it just as inexpensive to get a new crank if you can find one. Either way you need a left side pedal. Are the people you ordered from going to send you one?

Option 1 you don't want to consider at all unless you always pedal backwards. Normal pedaling will might loosen a right threaded pedal on the left side. I lost the link to a very good motion graphic that explains and shows why.