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in "theory" it should work, but it is all in the controller logic which I have my doubts it is prepared for. And how much effect it has depends on how much flux the shunt field can make.

I mean it is an interesting experiment, but don't expect an off the shelf solution. Things I would consider are:
putting the shunt fields in parallel so you can push more amps through them for a given voltage (or vice versa as necessary).

reversing the shunt field when you want additional field weakening.

etc. I would assume a custom controller and a reasonable test load to proceed, plus lots of trial and error and logging everything.

you might be able to get it to go in reverse at low armature current and high reverse shunt current.

I would use a full bridge on the shunt circuit, not a reversing contactor.

start by measuring shunt vs armature current at various loads/rpms/voltages.
 

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fwiw the "simplest" control algorithm is to slave the field current to the armature current at some ratio. But if you are writing your own field controller you can tweak it for other, possibly more efficient, modes.

Also this is a lot of work, and the motor construction might not even be suitable for the application, and rewinding it for series or sepex might be the easiest route anyway, just saying.
 
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