You can’t, but I suspect they’ll compromise on size, range or throw in the towel and get another ICE.6 month wait is what we are normally told in Canada for the clarity due to the high demand, caused by the combined federal and provincial rebates (5000 federal, 8000 provincial in quebec). There's waiting lists at every dealer for the car.
If you want a clarity, you'll wait 3 months. if you're not willing to wait 3 months, what will you buy? the Volt is discontinued. What other PHEV of this size and with this electric range can you get?