You are going against the consensus established by ALGOL and Scheme (and used by most languages in the functional camp since then) here. That's your prerogative of course, but personally I'd be wary of design choices that go against established wisdom.

With "var", the above code could allow "someVariable" to refer to three different things, each for slightly different sections of the above chunk of code.

Yes, but that's not an issue, as it is easy to check (by looking at the code section in isolation) which of the three bindings an identifier refers to - which is, for me, the definition of lexical, static scope.