Blast template generation from explosion data

Create a template that visualizes the rings of damage from the demolition explosion generator.

Requirements:

Must have a mobile friendly "lite" output, either SVG or low resolution
Must have a VTT friendly PNG output, with about 50% opacity (to see which tokens are underneath what part of the template)
intended VTT use is to drop on to the virtual table-top "over top" the miniatures and terrain to quickly reveal what takes what damage without measuring distance to epicenter for every miniature, item, area, whatever. Similar to war-game standard templates.
Must label each ring on the template with damage done
Must colour each ring on the template separately
Must be colour-blind accessible - use either alternating luminosity or rotating luminosity