The idea you described will not work. Putting a T into an open center pressure line will not provide enough pressure, unless you also simultaneously work another function on the valve bank that that pressure line feeds. Also, the relief valve plumbed as you describe will relieve the pump pressure on that side of the circuit for any function to 1000 psi, and will have no effect on the oil trapped in your thumb cylinder.
The proper way to do it would be to use a power beyond valve to operate the thumb. (I am making an assumption here that the factory system relief valve is in the control valve block.) One of the supply lines going to your valve bank would need to be connected to the IN port on the accessory valve. Then a line would connect the power beyond valve to the inlet port on the original valve block. The relief valve in the accessory valve would need to be set to match your current system pressure. There would also be a return line from the accessory valve to the tank. You could then put a relief valve like you describe in the “close” line of the thumb to allow it to release when the bucket is curled against it.
A valve like a Gresen V10 sectional would be really easy to configure for what you need and has the bonus of being able to put the work port relief right in the control valve. Not the cheapest but possibly the simplest.
The easiest solution would be to keep the setup like it is, just upgrade lines and possibly valve to handle the return flow from both pumps. Then add a relief valve in the hose going to your thumb.
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