If it's only 32K why don't we develope something brand new that perfectly suits our needs?
The 32K program I have written *is* brand new and designed to suit our needs (and unfortunately nothing in this world is perfect). The reason it is written in C++ is because that is my preferred language but it won't be a difficult job to translate it to Java (it is currently around 1,500 lines).
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).
Basically the "byte code" includes a few special "function call" ops which will support the creation of an API that the AT will have access to. At this stage some API functions will be to check received transactions and send NXT but if deemed useful I then other functions such as hashing ones could easily be added.