It is not difficult or expensive finding an approach for HS2/HS3. It involves using existing approaches and spending HS2/HS3 money taking the local rail of these approaches by using exiting mothballed trackbed and tunnels and using tram-trains. Here are three:
http://www.railforums.co.uk/showpost.php?p=2019821&postcount=514
Have a look at using the southern section of the Northern Line and moving the line to tram-trains tuning down Aigburth Rd and the Dock Rd. Tram-trains could run down Aigburth Road
and dive underground at Dingle into the existing abandoned underground Dingle station making the station a through station, down the Dingle tunnel and onto the docks and along the Dock Road to the city centre, probably running up the Wapping Tunnel to Central station.
You mentioning the use of the mothballed eastern section of the Outer Loop line to access the old Exchange station site also deprives Liverpool of a vital metro service to its eastern suburbs, which was was promised and works started over 40 years ago. One of the Walton twin tunnels will need finishing as it was abandoned while under construction in the 1800s.
If Exchange is to be the site for HS2/HS3 trains, it can be approached via Kirkby. To use this approach the tracks can be quaded; there is space along the most of the track for quadding. I few stations will need widening and the likes, but a good approach in. The metro is far more important to the economy of the city and its people, than another fast line to London.
The Merseyrail 30 years plan is better than nothing, but they are still trying save face over the HMG rightly cancelling that ridiculous stand-alone tram network. It never merged with Merseyrail showing the incompetence of this body.
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Exchange does make sense in that the city centre is moving towards the waterfront. Lime St is at the eastern perimeter of the current city centre. If the city expands in the coming decades the city centre may move further east of Lime St, as it once did and also move onto the waterfront.
Exchange is also handy for the cruise liner terminal, although when the Edge Hill spur is completed (Wapping Tunnel), the unused platform at James St can be used as a dedicated cruise liner passenger platform. The far end of platforms extends to the riverbanks. The entrance of the station was put were it is was because a dock was in the way when constructed which is now filled in. Installing a second elevator shaft at the far end will take passengers to the riverbank with easy access to the liner terminal. The shaft could surface inside a cruise liner terminal and jointly used for normal passengers.
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Wasn't this line used by the Liverpool Overhead to access Aintree?
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The approach to Liverpool has be to a joint HS2/HS3 line. As HS3 is best to extend to North Wales, with maybe a River Dee tunnel then it is best to have Liverpool as a through station. This means approaching Liverpool from the south or east.
Another point of having a new HS2/HS3 station is that it must have connections to all Merseyrail lines, and regional lines. This includes the City Line which would be on Merseyrail when the Edge Hill spur is completed. This precludes Exchange as it is too far from Lime St. A new underground station between Central, Moorfields and Lime St is the ideal solution for connections. Also one that runs into the Mersey Rail tunnel for HS3 trains to North Wales.