POC: wrapper for a function that can either run sychrnously or be awaited in an asyncio context:

sync_async.py

# here, the function that can work "either way" is the nested "payload".
# The external ^morphix_in_thread" can be a decorator, and "payload" the decorated function


def morphix_in_thread():
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        loop = None
    def payload():
        time.sleep(1.5)
        return 5
    if not loop:
        return payload()
    f = asyncio.Future()
    async def apayload():
        return await loop.run_in_executor(None,  payload)
    task = loop.create_task(apayload())
    task.add_done_callback(lambda t: f.set_result(t.result()))
    return f

  
 """
 
In [97]: async def main():
    ...:     return await morphix_in_thread()
    ...: 

In [98]: asyncio.run(main())

Out[98]: 5


 """