I agree with IAmSixNine. I have not tried it with my 436 but you may be able to program each repeater into a channel in the scanner and let it fly. Someone who knows the scanner better than I might know if you can put a single frequency in and have it rx on a CP signal. Now you have 6 "channels" programmed into your scanner. At any time, you can hold on a specific frequency. It won't care about TGID like Motorola radios require.
In an XPR7550, you should already have each repeater in the channel pool. Go down on the tree to CAPACITY PLUS > VOICE and create a CP Voice List. Add only ONE repeater. Name the voice list REPEATER ONE. Now create a CP channel and under SITE LIST, select REPEATER ONE. Do this 6 times, once for each repeater
Next, create a RX GROUP LIST with all your talk groups. If you have more than 16 channels, you're going to have to do this with two channels per repeater to cover them all. In your CP Channel, assign that to the RX GROUP LIST. This should give you 6 channels on your radio, one for each repeater. Whenever activity pops up on that repeater, you will hear it. Just select which repeater you want to listen to.
With 6 available CP capable radios you say you already have, follow this programming and put one radio on each repeater. You won't hear everything since you could be listening to TS 1 and there may be activity on TS 2 but I think it'll provide what your looking to do.