Execution Policy

There are a few ways to set the PowerShell Execution Policy in WinSE. I'll start with the easiest

AutoUnattend.xml Method

By far the easiest way to set the PowerShell Execution Policy to Bypass is to use an AutoUnattend.xml with a RunSynchronous Command

<settings pass="windowsPE">
<component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<UserData>
<AcceptEula>true</AcceptEula>
<ProductKey>
<Key>NPPR9-FWDCX-D2C8J-H872K-2YT43</Key>
<WillShowUI>Never</WillShowUI>
</ProductKey>
</UserData>
<RunSynchronous>
<RunSynchronousCommand wcm:action="add">
<Order>1</Order>
<Description>OSD ExecutionPolicy</Description>
<Path>PowerShell -WindowStyle Hidden -Command "Set-ExecutionPolicy Bypass"</Path>
</RunSynchronousCommand>
</RunSynchronous>
</component>
</settings>

That does the trick

Driver Method (OSDBuilder)

You can easily create your own Driver INF and add that to WinSE (WinPE and WinRE too) to set the Execution Policy. OSDBuilder easily lets you add this Driver

RegAdd PowerShell ExecutionPolicy.inf
;==================================================================================================
; David Segura
; https://www.osdeploy.com
;==================================================================================================
; Purpose: Set PowerShell ExecutionPolicy to Bypass
;==================================================================================================
; Compatibility: WinPE 10 x86 and x64
;==================================================================================================
[Version]
Signature = "$WINDOWS NT$"
Class = System
ClassGuid = {4D36E97d-E325-11CE-BFC1-08002BE10318}
Provider = OSDeploy
DriverVer = 10/19/2018,2018.10.19.0
[DefaultInstall]
AddReg = AddReg
[AddReg]
;rootkey,[subkey],[value],[flags],[data]
;0x00000 REG_SZ
;0x00001 REG_BINARY
;0x10000 REG_MULTI_SZ
;0x20000 REG_EXPAND_SZ
;0x10001 REG_DWORD
;0x20001 REG_NONE
HKLM,SOFTWARE\Microsoft\PowerShell\1\ShellIds\Microsoft.PowerShell,ExecutionPolicy,0x00000,"Bypass"