Probably it was the concept behind the OMC140 carbon tube, but as far I remember there were complains about "thermal bridges" originating from the rear cell.
Also, Intes' MCTs, due to their oversized tubes, probably create a sort of insulating layer outside the optical path even if this seems to be designed more as buffer zone, to achieve weaker inner currents than thermal inertia (the telescopes are in fact equipped with "cooling paraphernalia")
I have a couple of questions regarding your most interesting approach, if you do not mind:
-first, from what size the insulation approach is more rewarding than a fast cool down (if I remember correctly, it is also the stored "amount" of "heat" to rule the lenght of thermal stability when the container is kept in a cooler environment) when there is a rather large thermal gradient between storage and observing place (20°C or more)
-second, in the case of smaller optical tubes (e.g. 5-6" ones), how much these are affected by the "holes" in the thermal shield left because of a dovetail bar, etc...
Last, especially in the case of small samples, how the forced thermal stability may be compromised by the act of switching eyepiece in the case a mirro diagonal is used
Thank for you patience!