What is Reddit's opinion of Klein Tools 32239 Drill Tap, 10-32?

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Perfect.

Might need one of these if there is nothing to fasten to in the back:

https://smile.amazon.com/10-32-Drill-Klein-Tools-32239/dp/B019874Q1E/

 

^Item Info | Bot Info | Trigger

If your box is grounded you've got nothing to worry about, when you screw in the dimmer the screws will act as grounding jumpers but only if your box is metal which you mentioned it is. You may also, for reassurance, tap a hole inside the box with a hole taper and screw a copper pig tail with a green screw where you taped the hole.

Taper

Klein Tools 32239 Drill Tap, 10-32 https://www.amazon.com/dp/B019874Q1E/ref=cm_sw_r_apan_glt_fabc_KTM07VA50R5SSPFQS3S5?_encoding=UTF8&psc=1

Pig tail

Ideal 12 AWG Solid Grounding Pigtail with Screw, Green (50-Pack) https://www.homedepot.com/p/Ideal-12-AWG-Solid-Grounding-Pigtail-with-Screw-Green-50-Pack-30-3392R/202894316 SKU# 202894316