I had the ST-70 for about fifteen years. You are right about the bi-wire there. But I had new speaker jacks put in. The chassis was easy enough to modify. But I see you rather not monkey with it. So perhaps you change the cable termination to a common ring (or open jaw) that fits the screw barrier.
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These might be just what the doctor ordered
If you're handy with a soldering gun, you can probably build a set for a lot less ... just solder a section of speaker wire to a set of binding posts, strip the other end and put it under the screw barrier terminals for the amp's output
>>>>"I want to bi-wire, but will probably use jumpers when using the vintage amps."<<<
You should also be able to bi-wire now, as you have a standard binding post to put your Bi wire speaker cables into.