Okay no worries, thanks for trying. It is easy enough to modify the USB to maintain the OEM SLP.
I have been working on guides involving the Dell ISOs and have created in depth written guides and video instructions for Downloading the ISO and making a Bootable USB:
Download Dell Windows 7 Pro Multi-Lingual ISO (Media Refresh January 2016) from Dell and Make a Bootable USB
Put together a list of the ISO checksums and details (still working on it),
Dell OS Recovery Tool ISO Checksums
Made a slipstream script with DISM to bring them up to Media Refresh March 2019. The 32 Bit guide needs a bit of work still as I've mainly been focusing on the 64 Bit guide:
[64 Bit] Slipstream Updates (Media Refresh March 2019) and Drivers to the Dell Windows 7 Pro Bootable USB
[32 Bit] Slipstreaming Updates (Media Refresh March 2019) and Drivers to the Dell Windows 7 Pro Bootable USB
Converting the Edition from Dell Windows 7 Pro to Dell Windows 7 Home Premium. This conversion maintains Dell OEM SLP:
Convert Dell Windows 7 Pro Bootable USB to another Edition e.g. Dell Windows 7 Home Premium
Removing all Dell OEM customisation to make a Microsoft Multi-Lingual, Multi-Edition Bootable USB for all other Retail and OEM Licenses. Instructs are also provided to provide OEM SLP for the other OEMs:
Convert Dell Windows 7 Pro Multi-Lingual Dell Bootable USB to a Microsoft Multi-Lingual, Multi-Edition Retail or non-Dell USB (Covering all Retail and non-Dell OEM Licenses)
Finally converting the Slipstreamed Bootable USB back into an ISO for use with VMware:
Convert Updated Bootable USB to a ISO
These set of guides should cover almost all languages and all editions of Windows 7 for both OEM and Retail licenses.