The 24 seedwords are split to two different safe boxes with 12 seedwords stored seperatelly...
No. It will just make it more confusing for you to restore in 10-20 years, and you already have no room for error: one of the halves is gone, everything is lost.
If you really want to save the seed split in multiple locations it could be better to use something closer to a standard, like
Shamir Backup.