i'm a firm believer of "if it ain't broken, don't fix it"
i'm keeping these alive the last 3 years, and i don't think i'll change the way i do it.
we have many months with high temps here in greece, so no external heating is used.
I keep them in a semi-tall plastic ikea box with aprox 7 cm substrate and a thick layer of dried oak and quercus coccifera leaves.
During the first 2 years they spend 90% of their time in tunnels underground but lately they are always on top.