Both of these bootable methods will become standard practices for techs. Microsoft , I hope, will come out with these some day. It’s a bit of a task to put these two bootables together using BartPE. But it’s worth the effort.
With the increased appearance of very smart rootkits that cloak their existance by controlling the kernel there’s no way a tech can get the upper hand and clean out rootkits other than booting into a separate O/S.
If you suspect a rootkit in a system, without being able to a separate O/S like PartPE or Knoppix Linux and do your cleanup work off-line, the tech can only reformat and rebuild.