It's a while since I implemented arbitrary message signing with Keplr, but I was able to use keplr.signAmino. The thinking regarding adding it to cosmjs is that SigningStargateClient is already in the business of requesting signatures, and also has a signAmino but for some reason was not able to request the signature in this instance. Showing my working example with Keplr here for reference, as I think it shows something that's already very close to what Stargate offers (AFAICR):

await window.keplr!.signAmino(chainId, account.address, {
    chain_id: "",
    account_number: "0",
    sequence: "0",
    fee: {
        gas: "0",
        amount: [],
    },
    msgs: [
        {
            type: "sign/MsgSignData",
            value: {
                signer: account.address,
                data: btoa(message.toLowerCase()),
            },
        },
    ],
    memo: "",
})

MsgSignData is also already mentioned in cosmjs-types. If its presence there is warranted then maybe implementation in cosmjs is warranted.

Implement ADR-036 #844

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