Possible way to have 2+ keystones on PBE?

I was playing some games on the PBE after the new runes were removed. The old ones were kept and when I leveled up due to level cap removal, I got an extra point for my masteries. At level 18, you get your first keystone, so I was wondering if you could get a second one at level 36 and maybe a third if you grinded all the way to level 54? If you got to a really high level, could you fill out the entire page??? - Riot fix dis pls
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