I am new to ethereum and curious about interacting with dApps while keeping a private key in cold storage.
I like the idea of keeping the private key for an Ethereum wallet on an air-gapped computer. I have done this with bitcoin using a program called electrum. Electrum enables a workflow where you 1) generate transactions on an online computer, 2) transfer them to an air-gapped computer for signing, and 3) transfer the signed transaction back to an online computer for broadcasting. I know that there are similiar programs that can achieve this for Ethereum, such as MyCrypto.
Most of the Ethereum dApps I have come across (Compound, Uniswap, MakerDAO vaults) offer several options to connect to a wallet. The options are usually browser based wallet extensions (like metamask) mobile apps (like coinbase wallet) or hardware wallets (like trezor or ledger.)
Are there any solutions that enable using dApps with arbitrary cold wallets? For instance, some kind of browser extension that will generate the transactions to sign, and allow you to process them manually? That is, I envision that after being presented with the transction, the user would transfer them manually to an air gapped computer, sign the transaction, and then transfer back to this extension/app for broadcasting onto the Ethereum network.
If this is nonsensical then please don't hesitate to let me know :)