Check out Electrum Personal Server, it's like connecting your Electrum wallet to your own Bitcoin Core node, so you can use all the features of Electrum without the drawbacks of privacy.
https://github.com/chris-belcher/electrum-personal-serverSadly, I myself haven't used it yet, so I can't help you with any questions regarding it, but from the description of this project it sounds like exactly what you might need.
I didn't know Electrum Personal Server existed. It would require running a full node, which is not yet something I'm willing to do, but I'm planing to in the near future. It would be a great combination, as I like Electrum's features and its user interface and running a full node will definitely make Electrum more private and secure. Thank you very much for the hint.
Just use Bitcoin Core as a wallet too, but in a separate airgapped safe computer. In an online computer, you run the full Bitcoin Core node, here you have watch-only addresses to see actually how much money you have and keep track of finances. In an airgapped computer, you run Bitcoin Core node offline, and store the keys there for offline raw transaction signing. This is the best possible scenario that I can think. Electrum's seed thing is unsafe due possible key derivation schemes and having your wallet.dat safe is a better alternative unless someone can prove me wrong.