I also have JLTi phono, so all you need is cheap RCA connectors to solder some cheap resistors and you can make many with different value to try what you like.
Now you have 100 Ohm and 47 000 Ohm
You need something in between such as 500 Ohm, 1000 Ohm, 3000 Ohm and 10 000 Ohm for example.
In this case you don't know yet what is the best. Just buy cheap resistors to try different loading.
You can upgrade the resistors after you will understand what value do you need for your Zyx
Now you have 100 Ohm and 47 000 Ohm
You need something in between such as 500 Ohm, 1000 Ohm, 3000 Ohm and 10 000 Ohm for example.
In this case you don't know yet what is the best. Just buy cheap resistors to try different loading.
You can upgrade the resistors after you will understand what value do you need for your Zyx