CreatBot DX3 Mod

I am attempting to switch out an old PEEK designed hotend with a Prometheus V2. My issue is the new heat block provides a 3mm hole for a cartridge thermistor but the CreatBot’s thermistor has a 4mm cartridge. I am considering machining a new heat block with a bigger hole to fit the thermistor but was also wondering if I could just order an e3d cartridge since it would fit in the block. Does anyone know if this would work or if I am just better off machining a new block?

A vice and a 4mm hss drill bit would fix the problem fairly swiftly. No need to make an entire new heatblock.

The hole for the thermistor it right by the edge of the block so I'm not sure I would have enough meat to bore it out.