inscriber9000 serves all your inscribing needs. It will take whatever you want to inscribe, sign it with your private key, and then send it to the chain.
Caution
Use at your own risk. It's likely broken.
To run inscriber9000 you need to have rust installed. (See https://rustup.rs/). Then you can run:
cargo run \
--private-key <your private key> \
--chain=kusama \
--remark='{"p":"ksm-20","op":"mint","tick":"sama","amt":"1000"}'`
To obtain your private key, you can use the subkey
tool and copy "Secret seed" from the output:
$ subkey inspect "noodle able degree toast undo ...."
Secret phrase: noodle able degree toast undo
0x62f368839aa66ff80379dc9110f92c12b66914f959e2f7ea3e6d2589be5dc594
$ subkey inspect "///Alice"
Secret Key URI `///Alice` is account:
Network ID: substrate
Secret seed: 0x62f368839aa66ff80379dc9110f92c12b66914f959e2f7ea3e6d2589be5dc594