I recommend that you read the pages on this site :
http://www.arbcruncher.com/It gives full explanations of many types of betting. It has calculators which enable you to place bets manually in the way you describe above. When you have tested your system manually you can then go on to see if such processes can be automated, and more important, whether or not such a system merits all the work that would be required.
My knowledge of MFP and making triggers is still very restricted but I know about betting/trading. Be very careful when you are dutching. It's very easy to make mistakes, the bets are intrinsically complicated, and they could prove to be costly if they are not placed precisely. Also, the essential problem with dutching is that the whole series of bets must actually be matched if things are to go to plan. One failed bet and things can go haywire.
I mess about with the dutching function which is built in to MFP but do so only for fun. I am not the sort of person who would dutch for serious money because of my experience in screwing things up when I have used small stakes.
You may have hit on a winning system but you will not know until you give it a try.