Merging software and data releases

I use an NSIS script to make a software release, e.g. sim5.exe.
My client uses an NSIS script to make a data release, e.g. data5.exe.

Is there a simple way to merge sim5.exe and data5.exe into a single release for users? e.g. simWithData.exe

Simplest way would probably be compressing both into one installer and then executing them with ExecWait.