It really comes down to whether or not the Tenor and Concert bodies are identical.
For a bolt on neck, if the neck pocket is the same and the position of the bridge is the same, it may be as simple as bolting on a new neck (may have to shim it for the correct angle).
If they are not, the mods would probably be pretty tough, maybe impossible (within reason that you don't have a wood working/machine shop) if the neck pockets were different.
John
EDIT ADDED: The above is based if the attachment is similar to a Fender Strat.