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Single button startup-shutdown in MCP1640 circuit?

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aetosa

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I 've built an MCP1640 circuit powered by a 1.5V single cell battery. (no microcontroller in the circuit)
I want to start it up and shut it down with a single push button.
But the battery voltage starts from 1.5V and goes down to 0.35V (till the battery gets totally empty).
I was thinking something like this (which definitely won't work with e.g 0.7V battery voltage):

7daa68a2aff7d019b5efcda072eef81e.jpg

What can I do? Do you have any suggestions?
 
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