Were that me (I used KP), it would be in a different kdbx file. This is one of the benefits of KP, I have about 8 different vaults for various things. I don't like putting my eggs in one basket.
You lose the convenience of one file though. In this case you might as well use a purpose built encryption tool rather than force KeePass into this usecase. A VeraCrypt container or encrypted overlay filesystem are a significant performance and UX upgrade since you are already willing to concede managing one file.
You lose the convenience of one file though. In this case you might as well use a purpose built encryption tool rather than force KeePass into this usecase. A VeraCrypt container or encrypted overlay filesystem are a significant performance and UX upgrade since you are already willing to concede managing one file.