That is the correct hyd filter.
Always best to start with he easiest and cheapest, one not always being the other.
Since you can't verify the charge pump is working because of no porting, then that would be my next try. Punch or paint mark the charge pump housing and remove the charge pump to make sure the drive pin is intact. Clean and file/sand any burrs off the shaft before sliding it off to prevent damage to the seal.
It is possible that the intake tube is plugged also. You may be able to get the elbow off to check that, but the oil has to be drained. Do that while the charge pump and filter is off so you can blow through to the filter inlet.
You might still have the swash control roll pin sheared inside, but that will usually break under a load.
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