Yes!
HP BIOS Configuration Utility (sp68876) allows you to configure your BIOS using an executable from a command line. I've talked to a lot of customers who use this tool to configure various BIOS settings as part of a script while installing an OS image. Since Asset Tag is set in BIOS, this tool should be right up your alley.
Also if you are using a BIOS password, or need to set one up during your deployment, HPQ Password (sp69128) will let you generate a BIN file so the HP BIOS Configuration Utility can have the password available to run, or set it for you.
You can download both from http://www8.hp.com/us/en/ads/clientmanagement/download.html for free.
BIOS Config reads the settings from a plain text ASCII file. This file essentially matches what you see when you run 'replicated setup' from within BIOS and save a configuration. You can pare the config file down to only the settings you want to change.
If you are writing a script, you can just update the ASCII config file between machines if you need a different asset tag between machines. I'm not a VB script expert, but that should be something achievable. You can modify the config file via your script if you need to. If you don't need to change the asset tag from machine to machine, then you can just keep the same config file and run with it.