There has been plenty written on the insulation wrap. When it gets wet it will retain moisture and promote corrosion. When it accumulates dirt and debris it can become flammable. Conceptually, why would you want to keep the heat in the pipe, as opposed to getting the pipe cooler by ventilation? There are plenty of options for venting the sills. I have cats, OE insulation, no wrap, and no heat.
The inconel shields appear to be available from thinkabbott dot com.