The problem is that kickoff and lockin is the same goal : Opening event
4 international event, would be too mush, redundant ans too expansive, both format got the same goal : qualify team with the lowest amount of games possible to have the first final as mush as possible as the start of the season. Doing a lock in with a looser bracket may be too long and too expansive, thats why kickoff is an excellent compromise, it pays less team a ticket for an international event
To give you an idea you can make a swiss round with 64 teams and eliminating every team that have 2 looses, after 7 rounds, you would have 7 teams still qualified (One with no loose in semi-final, and 6 with 1 loose in quarter)
Another exemple of swiss round with 48 team, after 4 round and still qualify only team with 1 and 0 loose you would still have 15 teams