Boltzman's constant - and heat-work function? Mrrzy Avagadro was no potter!
Glib answer is throw it all together with wallmix and do test firings.
I used to love layering glazes - some would break through or be more fluid than the top one, some would go all crystaline white but thats the fun of it, the good ones were unrepeatable by anyone! This was all stoneware and some gas firings and sometimes reducing atmosheres. What temperature you going to?
I will consult at home (at the Library now and not easy to read/find on the screen). If I have an insight (or an incite) of a fresh answer I will post. I just llllllllloooooooove these challenges.
AND call me a pedant but this is an arithmetic puzzle, Excel here I come.
gotta dash ........... next surfer has arrived.