As I understand these rules, everything except point 6 can be changed by mutual agreement, so what are you so worried about?

The concern is about introducing a standard time limit by default.

That is, give two additional 6-minute slots. And, for example, let the player say they are taking extra time and use their auto-save.
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And the player, after attacking and losing, will proudly say, "I don't have time to make my move."

I have been suggesting this for quite some time. Specifically, in the current "One Save..." tournament, the following time limit has been introduced for testing:

We play with a 4-minute turn time, but each player has the right to load their own auto-save twice during the game. The right to finish the turn is realized as follows:
1 The player passes the turn.
2 They notify the chat that they are using their first (or second) auto-save.
3 They load their auto-save.

In my opinion, this is enough for a working version – of course, it can be further refined to exclude any other tricks, but I don't think it's necessary – here, the inviolable point 6 should already be in effect. In this interpretation of the rules, the level of trust is the same as when conceding in a console game, for example – if the opponent on the other side of the screen wants to cheat, they will. Points 1, 2, and 3 are to make it not too easy to do.
P.S. I think this is a good compromise. I will post the results and opinions of the players if needed, but I still don't think I have the right to publicly propose the introduction of this time limit yet. After testing it in the tournament and in the season, let people express their opinions, because this is a key change in the game format (introducing a new time limit by default).