From this page as of 2/2022 at SmartDeploy: https://support.smartdeploy.com/support/solutions/articles/48000976376-release-notes-and-schedule
"Enhancement: Create USB or ISO media containing multiple answer files - user can select the from the list of available answer files in SmartPE (USB/ISO only)"
I will be trying it soon. I have been using the same answer file with a lot of Platform Packs which has proven to be problematic at times. The goal is to use the same USB sitck for multiple types and models of hardware. I have seen some odd behavior when using a usb installer with many different Platform Packs. the most notable is the machine backing out a BIOS update presumably because an inappropriate update was applied. I will be opening a case for this.
UPDATE:
Well, it appears the backing out of inappropriate BIOS update is a Lenovo issue. We saw it for several weeks on many machines but it has calmed sown now.,
Additionally, a call with support suggested I stop simply copying the contents of the ISO to a usb stick and start using rufus, a free utility, to create the stick. since then Multiple Answer Files work just fine.