Ability to further custom horizontal slicers as buttons

With the introduction of Field Parameters, it is great to be able to easily use this as measure switcher for charts/graphs, with a measure name as a slicer. However, you are limited by the style/formatting of the horizontal slicer bar. In a scenario we have, we want users to be able to toggle between measures on a chart by clicking through buttons. We are currently doing this via buttons -->Bookmark actions, but this is a lot of overhead in the PBI to switch charts across 7 different measures. Using a field parameter on measures -->Slicer is an ideal way to reduce this overhead, however there is no easy way to make the horizontal slicer "look" like the buttons that the client wants. I would like to be able to further customize the formatting of the horizontal slicers to be able to play the look/feel the client wants while reducing overhead with the bookmarks.