The reason they don't do dutch on place betting is because of the complexity of the maths involved - how could you possibly work out the staking to accomodate all possible scenarios?

Will need someone more mathematically gifted than myself to give you a leg up - or even to advise over which odds ranges it is even possible.

In the first instance I would spend some time searching the Gruss forum, there is a lot of information and code examples available.

I can't help you with the dutching bit but should be able to help with specific questions re basic use of the spreadsheet.