Given your test results, draining and replacing would certainly be the easiest fix. Your fill water appears to be idea, or will be once you drop your pH a bit.

Remember, you'll have no stabilizer at first. If you use tabs to chlorinate, they will (1) add chlorine, (2) add stabilizer, & (3) lower the pH. Since you need all three actions, that would certainly make it easy. But, until you get some stabilizer in the water, the sun will strip chlorine very rapidly. Adding 1/2 gallon of 8% household bleach each EVENING will boost the chlorine enough overnight to 'keep' your pool in good condition.

Be sure to read the 'Best Guess' Cl/CYA relationship page, so you understand the trajectory your Cl levels will need to follow as your CYA rises.

Good luck!