I have tested a few things and I don't think it is an easy problem to solve.
I have personally never used the Tapped Delay - and I don't know why you need it in your specific application - but the issue I see is that the output dimension depends on the number of delays you put into the dialog. If you enter 4, then the signal dimension of the output is 4. If you chose 7, the signal dimension if 7. That's why it is very difficult - I believe even impossible - to provide it as an input port.
One thing I was thinking about, is that the Unit delay block can have the delay length as an Input port. You can change this during simulation. But it will only output the input signal with the defined delay, it will not provide all other signals such as the Tapped Delay block does.
With kind regards,