Best nogc method to insert element into the middle of an std.container Array?

[Red Frog via Digitalmars-d-learn]

I know inserting into the middle of arrays isn't the most 
efficient thing to do, but I have my reasons... I could increase 
the length by 1 and then shuffle all the values back one at a 
time... but I assume it'd be better to rewrite the back half as a 
single chunk?

I don't really know how to get ranges to play nice with container 
arrays, and even if I can I don't know if they allocate in GC 
memory...

Can anyone help me out with a good way to do this?