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The original MCI 500 power supply was humongous with a huge current rating, you wouldn't want to use that for bench testing! One little slip up and you'd have a fire on your hands.
With so many voltages there's no way to do it that's both elegant and easy.
If budget allows, the best way would be a combination of bench supplies with all the right voltages. You could switch them all on and off with a power strip. Bench supplies will have overload limiting and current protection. More importantly, they will probably have current meters for each voltage output which, once you become accustomed to the modules, will quickly let you know if anything is drawing too much or too little current. Another advantage is that if you have a shorted module, you can reduce certain supplies and safely service it at safe voltages without frying anything.
Another choice would be a random of new / used power supplies that include all the right voltages. It will look messy and won't give you nearly as much control as the bench supplies, but it would work.
You could build the whole thing from scratch, but it seems like a lot of work. With bench or new/used supplies, you could use them for something else after the project is done.
Save a lot of mental energy and time for the test harness itself. You'll need to include the insert, logic signals, group signals, etc. This is sort of fun design work, but it takes time. You might consider a rotary switch, to allow easy listening and monitoring of the buss, direct, send, L/R mix, etc.
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