Holà,
Well, I'm only going to talk about the second walross proposal, because the first one seems ridiculous for reasons very well explained by Joro.
PRO isn't showdown, and I hope, will never be. The second proposal is based on showdown current timer.
Is the current timer on showdown good ? No, from my point of view it's just a way to add more pressure to the player and it promotes him to make some mistakes due to the time remaining.
Is the current showdown's timer adapted to PRO players ? If i'm refering to the battles i've played/watched during the ladder tournament which is PRO meta on showdown, most of the time the timer is off while the battle.
So I suggest you learn from showdown's mistakes, and this said, I give you my suggestion:
We have a time reserve that can never exceed 180 seconds.
At the start of each turn, 30 seconds are given to both player to play.
First case: If the player plays before the 15 first seconds have elapsed, its reserve will be rewarded by (15 - the number of seconds elapsed) however it must be taken into account that the reserve cannot exceed 180seconds.
Second case: If the player plays between the 15th and 30th seconds, its reserve will not be rewarded, but it will not be decreased too, nothing will change.
Third case: If the player plays after the 30th seconds, the extra time will begin to be decreased, and if the player accesses his extra time when the reserve = 0, he loses the match.
That's in my opinion the best way for a balanced timer. Of course, it might needs some extra information printed on the battle UI, like the reserve and the current time.
Fum.