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Yeah you could have done this without buying a Trezor.
Since you have a Trezor already set up, and I’m assuming you have a passphrase.
You should just keep the Trezor the way it is and periodically update it.
The biggest risk you will ever have will be re-adding your seed to a wiped device (or other wallet). While if you do it securely it’s not that much of a risk, it’s still a risk. Why? Because you are exposing your seed. You could be accidently entering it into a fake Trezor app/website, you could accidently expose it to someone who sees where you hid it, etc.
It’s safer to just update the Trezor every 4-6 months or so. You’d already paid the money, have it set up, etc.
Plus as someone who, back in the day, created a paper wallet. I ended up using it way before I thought I would and then had to go through the whole process again.