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As many here who plan to operate a Rocketpool node probably know, the hot wallet required by the node software is a bit of a hot topic (pun intended). I opened an issue about this some time ago, and there are efforts underway by the developer team to solve this issue. Basically there will be a way to define a separate and locked withdrawal-address, where any withdrawals and RPL claims will be paid out to. This is an important security feature and should definitely be used for mainnet.
To setup Rocketpool on the Raspberry Pi I temporarily plugged it into the router for internet acces and used the RasPi setup guide, leaving out the Eth1 & Eth2 client installation parts and instead putting in the IP address of the staking machine on the internal network. Generating the node wallet is of course done after unplugging. Since the node and watchtower services only need RPC access to the two Ethereum clients and no full internet access this works quite well. The only thing that has to be done manually whenever you create a new minipool (which probably won't be very often) is to copy the keystore files generated by Rocketpool onto the staking machine running the validator. Either via ssh onto the staking machine (temporarily open the port) or via USB stick.