I had something similar in mind but possibly less error prone.
You use random.org or something of that nature to generate a random sequence of 24 numbers i.e. words in a seed list.
You write your seed in that order.
You encrypt the order of your seed using passguardian.com (number of shares according to your preference) by writing something like:
"eight 8 ; twentyone 21 ; four 4..." for double cheking
Alternatively you could use probably some other encryption tool with a simple passphrase.
You store something that looks like:
"802c27e53fc4a1c45fadb9c07e2ffcf71dc156fd6c661a7f61c169ebd668f0d659df5cab4297853
fb74733900c30f35166a6b78da8bcca67cd7e8"
at multiple locations.
You store the seed at home/friend/safe deposit box.
You can do all of this offline.
What it achieves:
1. Some malignant party retrieving your randomly ordered seed is helpless although they know it is a BIP39 mnemonic seed.
See
https://doc.satoshilabs.com/trezor-faq/threats.html2. You can memorize your seed in the right order by rote learning or by using memory techniques such as loci / storytelling / mnemonic peg.
3. Someone finding a share of your secret order can not do anything with one/two or multiple shares (depending on your preference) even if they understood it was a part of a secret (which is unlikely).
4. Even if they got hold of multiple parts of your secret order and be able to reconstruct the order they still need the seed.
So it is a tall order for someone to be able to get hold of all this.
Comments welcome!