I am trying to use the Rapid IoT prototyping kit to send data to Oracle IoT cloud.
Is it possible to send the Rapid IoT data to another cloud or API to process in a cloud other than AWS?
Yes for sure it is possible. This is not so much 'an embedded stuff'. By this I mean it will rather be managed by your gateway (typically phone bridging the kit to the internet).
You should take a look at this one:
We had developped this example for people to reuse and modify
See chapter 2.3.3 in the developper guide attached to the above post.