If you want strong typing (are you scripting in the large?), then, almost by definition, no scripting language provides that. If you need performance, switch to a compiled language (or a jit-compiled interpreted language) that most of your co-workers understand.
If Python brings too many dependencies, I guess you're trying to do something that is way out of the realm of possibility for bash, so you're not looking for an "alternative" to bash, you're looking for the best language for whatever project you're undertaking. And you may not be able to get away from the dependencies if you're trying something specific/sophisticated.