It would be hard to say for sure without seeing a proposed plumbing diagram for your concept. But a pressure tapped gas tank, just running to the standard unmodified Walbro carb, will not pass any fuel past the reed valve without a pulse from somewhere. But, you do have an interesting idea that may work if the pump diaphragm has both the reed valve parts cut off. That might have a chance of working. In fact, I would like to try that. If you do, please report the results.

I also read the post on here where the owner of the Moki said he uses that high end electric fuel pump. I don't have a Moki, and I don't know what kind of carb is on there. I'll research it, but I do wonder, IF it's a Walbro, if Moki has done some kind of mod on it to pass the gas thru it. I don't know, but wouldn't be surprised.