I haven't, but if all that is needed to get the eTicket you want is a few dummy dates, right or wrong, why not go for it?

Edited to add: I realize there is a possible problem with ANC but, hey, the agent is giving you option 2; I would accept it and put the ball in his court.

By the way, for the benefit of newcomers, I want to correct an error in the agent's response, probably due to haste:

"as long as the routing, class and airline remains the same"

The "airline" part is incorrect.