Chaz,
Here is a link to an album that I made that shows how Parker hammer less hammers and mainsprings are removed.
http://parkerguns.org/forums/album.php?albumid=366
I also have another that details the action's removal from the stock. The work is not super difficult, but you definitely need the right tools and good hands.
There is no reason why hammers and sears cannot be put into your Trojan that are not a matched set and have them not work. Maybe minor adjustments would be needed for proper trigger pull and sear engagement.