Stuck collective - by all means. A practical situation requiring some form of training.
Stuck Cyclic - get real
You'd die very soon after. You certainly wouldn't have time to go through an emergency procedure. The moment it jams in a position anywhere away from the trimmed level position - that a/c is going to lean in that direction, more and more and more...... until you are out of control completely!
How can anyone teach a jammed cyclic??
[After thought: maybe, just maybe a helo with full autopilot and the cyclic trimmed for S and L might make it on a wing and a prayer.]