ASR33 as storage medium on PDP 11/05

Hi to all! My PDP 11/05 came, when it was first sold, with an ASR 33 as the only console and storage medium. Later it was modified to a system with RX02 Floppy and one VT Terminal (connected to the 20mA loop but with 2400 baud instead of 110 as for the ASR). Now i would like to reconnect the ASR (or another papertape reader/puncher) to the system without having to screw up the CPU to reduce the speed of the serial line interface. I don't want the console-output to be printed on the ASR but reading/punching papertapes would be fine. As i remember DEC was selling its high speed reader ( PC11 ?) but only for fanfold tapes. Maybe this can archived by adding one extra interface to the unibus and a piece of software. I'm not sure. The machine runs RT-11 V4.0 Regards Axel Harten. --