Can canthopexy be reversed and then get canthoplasty instead?

I see in your post, preoperative photos. To address your question, a post operative photo would be very helpful. Don't talk yourself into something that you don't need. Canthoplexy is generally a weak lateral canthal surgery performed by eyelid surgeons who are skilled at performing canthoplasty. Having said that, for your facial anatomy, canthoplasty alone will not lift your lower eyelid. If you persist at this, some well meaning surgeon will harm you. Caution is advised. For more detailed advise, a personal consultation is recommenced.