Here goes:
I see you have modified your original and are now proposing a short extension of 3rd rail from Ormskirk and not all the way to Preston. Going all the way to Preston would have meant quite a few miles of 3rd rail and OHLE side by side which creates numerous problems.
The area is more prone to flooding than some and so I would prefer conductors to be overhead rather than ground level.
The Northern Sparks report which I can link if required put Calder Valley all the way through from Leeds and Bradford to Blackburn and Preston and not just Rochdale route as Number 1 priority. This would be OHLE. Therefore, from Farington Curve Junction (high level) at least (probably Moss Lane Jct too), into Preston would be OHLE.
I know at the moment only Lostock Jct -Wigan station Jct is being electrified but there are aspirations to make it to Southport and via Atherton OHLE.
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I get reinstating the curves proposal got rejected but could come back. So, in my opinion, the only thing that has merit is to 3rd rail to Burscough Junction and battery from there with OHLE eventually though to Farington Jct but not in my lifetime.