Looking at your tree here, I don't think you should give up on pines. Black Pine needle reduction can be accomplished by a number of means, but most all involve the removal of the spring candles, either partially or entirely. Mid-summer is usually when this is done. This leaves the tree just enough time to put out a new set of candles before wintertime.
If you follow the link back to the
TreeBay Bonsai Tools & Supplies site and click on Articles->Pine, you'll find one method that is very effective at reducing needle length. This, and other needle decandling methods should only be used if the tree is in perfect health, and only on black pine. Your tree seems to fit the bill perfectly.
In looking at your tree from a design standpoint it has very nice lower and middle trunk movement, but it gets a bit straight towards the top. You might think about wiring this part of the trunk, or cutting back to a point that offers an apex with more movement.
Regards,
Matt