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Keeping private key for signing transactions on a local server

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Need an idea for not storing private key to sign transactions (on public server/database file system).

The private key is needed to sign the transactions for transfer function ERC20 standard.

To accomplish, my initial thoughts are (for bip39 and bip44 wallets):

  • Generate all the address with master key.

  • store only public keys for different users.

  • Record the list of transactions to be done for the day and store details on database (list of addresses and amount transferred).

  • On a local server (say a 4gb RAM laptop with private master key) get the transaction details and execute transaction.

  • keep the geth RPC options off.

Is this approach in any ways more secure than storing private key on server?