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I think comments are not the ideal solution just like the transfers.... A website would be the most expensive one but on the other hand the best solution!

Exactly, a website would be useful.
For instance, I use github pages (see my post of custom feed), these pages are free.... but they are static pages. Then I use SteemJS, in this order, we don't need a server and all the magic happens in the browser of each one.

Okay, I think that would be a nice solution. However, the only problem is that I don't have any experience coding in javascript... Maybe we would collaborate. The main part of the bot is only 40 lines long in python!