Indeed; therefore the airlines involved are likely to be watching any such tickets more closely and the OP should not give them any reason to take action. The passenger is always expected to travel as booked. You can expect no lenience from the airlines, particularly when you have taken advantage of a fuel dump to drastically reduce what you paid them for travel.

Failing to take the "unnecessary" flights will likely result in the need to pay for a brand new one-way ticket on the day of departure, which is likely to cost many multiples of the original price, which seems to have been in the region of 132 Euro....