Yes you can use in-tank pump.There will be a 2 pin sureseal connector in your loom, labelled 'aux fp' or 'pump out' somewhere, mine is above the batteries.
You can then run a feed to the pump without having any other part of the car live.
I fitted a fused switch to both my cars connected to the loom by 2 pin connector that is located just behind near side of bulkhead. I believe only 1 needs connecting from memory. Makes pump out so easy