Brush cutting , selective weed

Looking for someone with experience on a brush cutter, I have 2 hectares of land I have planted in native wetland plants. There are a number of invasive weeds like pampas, ragwort, thistle etc that I need selectively cut leaving the wetland plants untouched. I’m looking for someone to do a full day once a fortnight over summer. Location of the work is [Content moderated for privacy]