Although there is no good way of having different chord symbols on different instruments right now (this is something we will add in future), I’m surprised that you find it so cumbersome to hide chord symbols in areas where they’re not wanted that you would rather use text items! Clearly that’s only practical for simple chord symbols.
In the forthcoming update, as I’ve written elsewhere, there are two tools that I believe will make this less cumbersome: one is the ability to quickly select more chord symbols (or indeed more items of any kind), and the other is the ability to be able to bind a key command to hiding a selected chord symbol.