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I currently have a P1 one plan and I know you can't transfer one to the other. Is the only way to do it is by cancelling the P1 sub and let it expire and then once expired start a E1 plan?
You could start the E1 now, that way while both are running you move any stuff over that you need.
Hope this helps
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Not sure what is blocking you, or where you clicked to get that error, but I had both an E3 and P1 trial at the same time, so I know you can have more than 1. E1 plans however do seem to be available as a trial, so if you are sure you are headed that way, just click the buy now on Microsoft.com.
I did do the buy now.