Sure, If you stick to strictly therapeutic level dosing/frequency, then you won't experience those horrible withdrawals everyone talks about. I don't know what is therapeutic recommended dosage wise for the sulfate but for sodium it's 12.5mg three times a day. Sulfate is probably a little higher of a dose with less frequency, something like 25mg twice a day, but I'm only guessing here so do some research.
Can somebody use it responsibly? Of course, I think with the correct mindset going in it's totally possible for a lot of people. Probably not a good idea for addicts especially those with previous opioid issues.
I purchased Tianeptine the first time with good intentions. I enjoyed my first few therapeutic doses but unfortunately my internal addict's interest was piqued. So I tried a large dose 'just once' to see and I liked it - a lot. Soon I was taking large doses a few times a week, then daily, then every few hours. Rest is history.
I'm an addict and I give in to my urges to easily, especially with opioids. I should have known better, actually I did know better, I think in the back of my mind I I knew what would happen. So for me, it was a bad idea to get Tianeptine in the first place. For you? I don't know, you are going to have to make that decision for yourself.
Keep in mind you worked your kratom doses up very very high and eventually were using often enough to get some withdrawals when stopping. You can't do this with Tianeptine, it won't end well. The withdrawals are horrible - like heroin intensity horrible.
If you are going to use it then set strict rules: stick to strictly therapeutic doses with zero exceptions. If you break rules, then flush everything, walk away and don't look back.
Only you can make the determination whether or not this is feasible for you. It wasn't for me...