If a small portion of 2048^12 or 5,444,517,870,735,015,415,413,993,718,908,291,383,296 looks easy enough for you.
Why don't you just go straight create a 128-bit entropy to create the seed phrase instead of scrambling words?
2^128 is relatively smaller than 2048^12.

You'll save a few billion years by going for that.