Originally Posted by
ThermionicScott
If you think 0.2mm per shift
less will cause overshifts into the spokes, perhaps you should think about it for another moment, ok?

you should think about not laughing.
the op has already considered a solution to the extra shift position... you did not. I guess you are the one that needs to think.
and i still advise the OP get an 8 speed rear wheel, as i did above.
the hassle involved with misaligning a chain with almost every shift is immense, and will compound itself via wear and false shifting caused by bumps in the road/trail.
laugh at yourself, scott.