Move the save data/will it be automatically moved from Sleeping Dogs to SD: Definitive Edition

You can continue to gain your Triad XP after completing the story by replaying the Triad missions. The amount of XP given for replaying a mission is equivalent to the difference between your final score and the highest score from your previous attempts at the same mission as long as it's greater than 0. There are clothing sets that you can wear that increase your Triad XP gain (5%, 10% and 15%). Here is a set that gives you 15%:

• J. Jiggler Straight Leg Jeans ($21,620 from Achete)
• Couronne Puffy Vest Red ($28,800 from Bruno James)
• Achete Stand Up Boots Black with Brown Sole ($17,400 from Bruno James)

Both shops are found in Central.

You should, theoretically, be able to get max Police XP before completing the story. In case you don't, you can gain them by replaying Police missions. You might have also noticed that there are optional drug bust missions (light blue police shield icon on the map) dotted all around the map, 17 in total IIRC. These missions will also give you a good chunk of Police XP. You should get the achievement associated with unlocking all 10 police upgrades way before the Triad one.

All missions can be replayed from START > Social Hub > Missions.

Unfortunately it is not possible to re-map the movement to use the arrow keys in Sleeping Dogs itself. There is a rather large topic on the official Sleeping Dogs forum where a lot of annoyed individuals have vented their frustrations.

It also seems that the developers have decided that a Third Party solution to the problem is adequate and it is unlikely that it will ever be fixed directly in the game.

I can see via your edit that you have found AutoHotKey but are having some issues. Have you remapped the arrow keys to something else (key pad is the most suitable I'd think). By default, I believe the arrow keys are used for the in-game mobile phone. If you haven't remapped these, I guess there is a conflict.

In the topic I mentioned earlier, I found a quick tutorial to set up AutoHotKey from the user "Bamamsterdam", so thanks to him:

1. Install "AutoHotKey"
2. Run it.
3. Right-click on the icon in the system tray and select "edit this script".
4. Keep or delete the text (doesn't matter).
5. Copy and paste the below commands into the script

up::w  
down::s  
left::a  
right::d  

Numpad8::up  
Numpad5::down  
Numpad4::left  
Numpad6::right

NumpadAdd::Enter  
NumpadEnter::Backspace

6. Save and you're done.

Hope this helps and that you can now play the game.