onawait | Async wrapper to manage try ... catch blocks | Reactive Programming library

I'm attempting to write a function that will start n coroutines and wait until the first m to complete. Should m coroutines fail to complete within some timeout, then all coroutines/jobs are canceled. My initial implementation for this is shown below, however I feel it can be improved. My initial thought was to use a parent job to run all other jobs under so the parent job can be cancelled and cascade down to the remaining children. However, this results in a TimeoutCancellationException that has to be caught.

How do I write a function to start n coroutines and wait until the first m to complete, or a timeout to occur before m coroutines can complete?