Certainly, the government will not stop with Ledger, they will continue to attack other hardware wallet companies is inevitable. I understand the solution you are suggesting. But how and how can we assemble a hardware wallet for ourselves? How is it that an ordinary person like me, who knows nothing about hardware engineering or basic assembly techniques, can do it on my own?
I am also struggling to find another solution because I know that it is only a matter of time before hardware wallets are controlled by the government. I am also considering using a separate computer or smartphone with the Electrum wallet installed and dedicated to storage only. I don't know if it is more secure than a hardware wallet?
There are hardware wallets that are designed to be completely air-gapped and employ technology which eliminates any possibility of online connectivity. Transactions are signed exclusively through SD cards or QR code scanning, leaving no room for private keys or seed phrases to be exposed. With these security measures in place, governments have no means to compromise the security of your assets stored within such wallets. Oh, and don't forget to ensure that the wallet software is open source, thoroughly tested, and verified, and I think you're pretty safe.