Both the Power Users Utilities and Developer Utilities runtime options supply all the shell environments that come with the Toolkit products.
MKS Toolkit products also provide two sample shells (tcsh and pdksh) in the /samples of the CD. One of these may work. Your application would need to install these because they are not part of any MKS Toolkit rutime component.
You may also be able to rewrite your shell commands to use the Windows command processor. | 
