First off, I don't think there's a way to change the behavior of SOAP::Lite directly. Writing a custom dispatch class isn't all that hard, since the basic method pattern looks like this:

sub some_function {
    my $self = shift;
    return Some::Other::Package::function( @_ );
}
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Besides writing them by hand, you can autogenerate those in a number of ways. One way is using string eval; another could be to mimick what modules such as Class::Accessor do for method generation.