If it's only 32K why don't we develope something brand new that perfectly suits our needs?

With optcode thats too low level i see some problems.
Interpreting such code will be slower because it takes longer to interpret many short commands, than to interpret a single long command (assuming optcode in both cases). Especially if you have to count every single command, and check you did not exceed the command limit.
Many small commands also require more space what makes these transactions larger.
In this case i think something that has commands that can directly handle strings, arrays, hashing, encryption and signature functions would be great.
This could be done by a bytecode interpreter as well (we could have bytecode commands that can handle this stuff directly).

I would be interested in creating a concept and code that. But i am a noob in Java so my code might not look that professional.