The client seed isn't something that needs to be kept hidden from either party. As soon as you set it, the casino knows what it is.
Getting the "secret" on your side known by the house can let them doing any manipulation, drawing any result they want
in example if they detect you playing auto-bet will let them know the bets that will be placed
Sha-256 provides all the 'randomness' needed I think.
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I mean a tool that will be hold externally to prevent any manipulation from the casino
For example with using an extension/tool, which will encrypt the (secret of yours/on your side) and prevent casino accessing it
It will be able to hold all the randomization process, so avoid any manipulation/falsification from the casino
With an external online tool hold independently in an external server, the casino would have to just set at one time the process that needs to be followed