It is a valid possibility.
Note that Qt allows you to go even further and do the following:
QObject::connect(&sender, SIGNAL(mySenderSignal(int)),
&receiver, SIGNAL(myReceiverSignal(int));
That's right, you can bind a signal to a signal. All it does can be seen as "when the sender's signal is emitted, emit the receiver's signal".
If you don't have any specific task to perform in your intermediary slots, that might save you a few lines, while showing exactly what you're doing: you're "forwarding" a signal. Otherwise, if you must absolutely do work in between, then you must keep the signals and the slots.
Note that you still have to be sure that the signals signatures match.