To the best of my knowledge, all of the newer made Tradition's use the plug installed thru the side of the breech threads method on their barrels.
This is shown in the upper right hand area of this drawing I made.
The only difference between the flintlock vent that is shown and the percussion drum type is the drum extends further out from the side of the barrel and it has a nipple installed in it.
To modify the percussion drum to work as a flintlock, all of the exposed surfaces of the drum would need to be removed. Do NOT remove the plug. Instead, saw off the majority of the exposed drum and file the rest down to be flush with the side of the barrel.
After this is done, the hole that remains in the plug must be drilled using the right size tap drill and the drilled hole will need to be threaded.
This is a one way journey and once it is done the percussion configuration cannot be reinstalled without major surgery.
The lock can be replaced with a Traditions, CVA or L & R replacement lock.
That L & R lock will cost about the same as the gun is worth after it is converted so if someone is going to do this, they are doing if for themselves. They will never be able to recoup the money they have invested in the gun.