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>It does seem that there is no easy or relatively cost effective way of duplicating analogue diode matrix operation of points if considering to changing using DCC.

You don't have to control your points from DCC if you don't want to. If you are happy to design an analogue diode matrix to control the points, you should be able to work out how to add a separate supply path from a DCC controlled source. I am speculating here, but if a motor coil has one connection from the matrix and another from a DCC source and each path has a diode to prevent current from one flowing back up the chain into the other, then you can have a system operated either way.

The hardest part may be finding a DCC controller which is powerful enough to move a standard Peco motor, but I think Wiggy has answered that already.

or maybe that isn't what you're looking for?

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