Java Card 2.2.2: temporary RSA public key as transient

I'm designing a Java Card (2.2.2 thus Classic) applet that will, at each use, receive a RSA public key (validated using means immaterial to the question), then use that RSA public key to verify an RSA signature.

How can I keep that RSA public key in RAM (rather than writing it in EEPROM/Flash), for performance and device lifetime reasons ?

My problem is, in javacard.security.KeyBuilder of JC 2.2.2, the buildKey(byte keyType, short keyLength, boolean keyEncryption) API does not seem to have an option to specify transient memory; I see neither

• a suitable keyType combining TYPE_RSA_PUBLIC and transcient, as we have with TYPE_DES_TRANSIENT_DESELECT;
• not even TYPE_RSA_PRIVATE_TRANSIENT_DESELECT which conceivably could be abused into a public key (on platforms with no test for the size of d), for this is a novelty of Java Card Classic 3;
• the buildKey(byte algorithmicKeyType, byte keyMemoryType, short keyLength, boolean keyEncryption) with a keyMemoryTypeparameter, which also is a novelty of Java Card Classic 3.

Would bracketing all changes and uses of my RSA public key with beginTransaction() and abortTransaction() achieve my goal?