simplemarket and buddypress

I know that simplemarket is not buddypress compatible, but i was able to use the bp template pack to make it so.

My question is, how can i make so when an update becomes available for this theme that I will not have to rerun bp template pack?

is there a way i could create a child theme for simplemarket and have the buddypress settings there? so when the parent theme is updated it will not break the site and still hold the buddypress settings?