This has always been my main concern about Bitcoin: the balance between making sure I don't lose access, and making sure nobody else gains access.
Good, it should be all of ours biggest concern. Ultimately, we're responsible for our own money, and that doesn't come lightly. I'm going to sound like a broken record, but this is the classical problem of balancing security, and convenience. If you have it too convenient you're likely making it easier to attack. If you don't have much convenience you'll likely forget or lose access to your Bitcoin.
This is why you see people put passwords on their routers, but keep the password in plain text next to their computer. This is why you see organisations invest thousands into safes to store data, yet they keep the door propped open via some boxes. This is a common problem within all industries which require a level of security.
Ultimately, we're all lazy, hence why most people that don't make a conscious effort to implement a good security protocol, end up being very easy to compromise. Hence why most people use very similar passwords. Then, we have people that go over board (I may have been guilty of this, multiple times), and over complicate things, which the trade off isn't worth that extra complexity, since you're effectively either encouraging short cuts because it's so damn inconvenient or you're setting yourself up to forgetting or losing control.
What OP has proposed is flirting the line with over complicating something, that doesn't necessarily need to be too complicated.
I've seen many topics from people who don't know how to access their standard wallet anymore. I've also seen people lose access to their funds because of their own handwriting.
Any complication you add, largely increases the chance of losing access by yourself.
A problem that I think is more common than we're led to believe. I've done it, not with Bitcoin, but other things. Especially if you haven't taken the care required to separate a 5 from a S. These are the things you need to think about when backing up though. Using a computer potentially leaves a digital trace of that seed, while hand writing has the issues of spelling, or just the way you write things.
Plus, it's the fact that you should probably be guarding towards health issues if you're going this far into depth to secure your coins. The more complicated you make it, the less likely you're to recover it, if anything were to happen to your mind, e.g dementia.