Edited Ryan Freeburger (May 16, 2019 03:22:53 AM)
At this time, the answer is a conditional “yes” - if someone is able to cut the cards precisely, such that they're indistinguishable from cards you'd find in a booster, then they meet the criteria in MTR 3.3 and can be used.
There is an exception for Alpha cards, but these are not Alpha cards - so that exception doesn't apply. The cut must mimic that of a “normal” Magic card to the extent that we won't consider them Marked Cards - i.e., I agree with your thoughts re: the difficulty of cutting cards correctly.
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