is it possible to replace xs versions with plain text versions?

In the general case, no.  In some cases, there are pure-Perl versions available, though (which run slower).

What exact problem are you trying to solve? Are you booting from the LiveCD, and then want to run scripts which come from some other data source... Or are the scripts included on the LiveCD? Or what?  In case you could somehow supply the appropriate .so files for the architecture-specific modules (e.g. built on some other comparable (same architecture) machine), you could put them in some local Perl library directory...