Ok...A330-A340, would concede (more or less) the same for type ratings.
Maybe adding the A320...quite possibly.
Picture this.
TWA.
Triple qualified guys.
B747.
L1011.
B767.
Yes. it was possible, and I
personally know of two guys that did just that...for over five years (there were more than ten, that I knew of..more possible).
Triple qualified.
Yes, they spent a
LOT of time in the sim, but it meant that guys down line had the ability to operate whatever came their way.
They have my admiration...a difficult position, for sure.
I would personally never hope to be in this position, yet these guys carried on regardless...superb performance.