Don't really know of any 10th tracks converting from astro to dirt. There are a few grass tracks which when the grass has been scrubbed form the racing line, have the closest thing to dirt.
We ran RHR dirt for several years, including the 2015 Euros, but have found the maintenance far too high given the UK climate. We have covered the dirt with primafelt GT, some of which has been down 12 years and is wearing extremely well. We use the Schumacher Honeycomb in the dry and silver mezzo in the wet - you might call the track 'simulated dirt', we always get good feedback from those racing on the surface, so there does appear to be an appetite for lower traction surfaces, but the maintenance that goes with it and restriction from running when very wet seem to outweigh a move to dirt in the UK.
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