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As for using rust: Embedded rust is fairly advanced, This is what the (official) project template looks like. So unless you're interested in actually learning the language and ecosysten (or know it already) I'm not sure if I would recommend it. In that case you'd be better off using something simpler like arduino.
As for 240x240 SPI LCD display support, I'm not sure. You might be able to find something on This curated list or on https://crates.io/
But I'm using the https://github.com/pimoroni/pimoroni-pico firmware with the PicoGraphics module. There doesn't seem to much documentation about compiling their version (except the c version?)