Hypothetically speaking, if you store your seed in an offline password manager you have to import your seed at some point and have it online.

Some hardware wallets make attempts to get you to type in extra words and import words in different orders or as repeats which makes it harder to decode a seed (but not neccessarily impossible).

Also, if a ledger works liek a trezor, you'd have to show your seed on your computer before you're able to redeem your funds which has huge implicaitons on your security sincec anyone with access to the machine through malware can gain access to the information. If you only use the seed on a live version of an OS that has been signed to be authentic then you may be able to store you information this way but I'd still be wary that you use enough encryption on the password manager...

If you can, use at least 8 random words, there are examples everywhere of how to do this...

It is not safe if you are using KeePass on online mode not on offline/airgap PC this should be offline forever to keep your seed safe in your PC.
Any documents or important backups like 24-word seed are always safe to store on the PC which is completely offline(Never connected to the internet).

Since this is related to hardware wallet are you planning to use the ledger hardware wallet on the PC with ledger live? It needs the internet so if you use your PC online it is not safe to save the "24-word seed" on the KeePass even this software is offline. We don't know exactly if this password manager is not sending any data when the PC is connected to the internet.

Unless if you are a programmer and you can verify that it is running completely offline and not sending any data from KeePass to internet when the PC is online. But for us who doesn't know if KeePass is safe while connected to the internet. We will always choose to save it to paper wallets instead or save somewhere safe than KeePass.

Hackers can get into your computer and you might be lose that seeds and got hack as well, this is why we should protect our seeds at on our code. Ledger have their own sheet to write down your 24 seeds, if you don’t want to use it then its better to write it down on another paper so it looks like a normal words to other people. You can encrypt the excel file, but still hackers can open that and you are risking too much money on that.

You are correct, by storing digitally people often think about storing it in plaintext. But using strong encryption with a strong key makes it much safer. It's still better to not have your encrypted seed on an online machine or the cloud, but storing it on a USB stick and using it offline with Tails is perfectly valid. If it's encrypted, it's not different from a password-protected wallet file.

I was thinking about Electrum, sine JSON files are usually used by Ethereum wallets, but they both count as password-protected wallet files. Just make sure to make a really-really good password, and come up with a method for backing up said password, because if someone steals the file, they could spend as much time as they want on trying to bruteforce it.

Can you send me some links on this. I cannot find anything on adding words to increase security of your 24 word seed

It is always advised and encouraged to use offline methods to store seed key or private key. With electronic device, it is easy to be targeted by hacker and that will not be a hard job to get access to your seed key or private key. Seed key can be hand written on paper too, make couple of copies and store them on different safe place.

Yes!

You could leave a note on the USB drive in plain text as to how to decrypt (obviously not including the password) to remind yourself.

I think buying a new computer is a bit overkill. Using your current computer to boot up Tails (without connecting to the internet) should be safe enough imo. Just to make sure, you can disable the other HDD/SSD or network card on your BIOS if you're paranoid that somehow you put the data on the wrong place or unconsciously connect the computer to the internet before you boot it up.

In theory, password managers can be less secure than hardware wallet. In this case you can just use software wallet if you store your data in program