Hm?
This post is half strawman.
OP asks if something is possible. The answer is yes. I'm not saying it's without dangers. Even listed dangers myself. Maybe you're the one who needs to read more carefully. Also write more carefully.
OP even claims to have had therapeutic benefits already.
Well you didn't answer any of my questions, but I'll play along and answer yours again,
seems that's the way conversations with you tend to go.
You do need a holder of the drug that only gives it out the drug in specific intervals.
If that person is you, you're the 1 in a 1000 who won't cheat, then yes, you can
This is why I'm generally advising
against self-medication, as you will be key motivator and supervisor, and wouldn't someone depressed cling to anything that made them feel better even if it's a short term solution? And wouldn't the same person have big issues managing the drug properly?
Is it truly therapeutic benefit risking an addiction? I'm sure if you suffer from depression, short term, heroin is a great solution, you'll instantly stop being depressed, but long term, you cannot
trust yourself with it. The same is true for many drugs, and yes, Ketamine is quite addictive and can have very severe consequences to your body and psyche if abused.
I'm not saying OP shouldn't try to get better. But drugs can never be the end all be all solution to your problems. Use the drug to motivate yourself. Use the motivation to do sports, and eat healthier, doing more for yourself. Taper the drug
ASAP. That's my advice if you want to go with this