Hi David,
From my experience of supporting customer, I think the most commonly used emulator is P&E Multilink and Multilink FX.
PEmicro - P&E Microcomputer Systems: Over 30 years as an Industry leader in Embedded Systems Develop...
You can also use Jlink with MCUXpresso, please refer recommendation here:
Arm® Cortex®-M0+|Kinetis® KV1x Motor Control MCUs|NXP
Hope this helps.
Have a great day,
Jennie Zhang
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