Take the car to a Honda dealer and have the CVT Flushed, alternatively you can have it drained and refilled but this wont remove all the gunk from the transmission.
if the problem still persists straight away then that means damage has been done to the start clutch, and the only way to completely remove the shudder is to have the start clutch replaced ($1600 from honda from memory)

If the flush eliminates the problem then just have CVT fluid Drained every 10,000kms at the service, you can even drain it yourself and fill it up.
and then a flush every 50,000 or so, but a flush needs to be done by honda since they have the machines.

good luck