I had a thread trying to accomplish a somewhat similar thing some time back over on giantitp (can't link as it's still down at this time...
), specifically to create a deathtrap room that nothing could escape from alive/undestroyed.
From what I recall, the result was a voidstone box (with super-boosted hardness) that abused the Wondrous Architecture and Lair Ward rulesets, as to have the inside subject to AMF with auto-trigger Disjunctions and Globe of Invulnerabiltity layered on top in case of AMF by-pass. Another addition was Anchor Mists (Dungeonscape p. 140), to add a non-magical Dimensional Anchor effect. Essentially, once inside you had no choice but to content with constant voidstone exposure while unable to use/benefit from any magic; making death mostly inevitable.
The project was left a tad unfinished though. Certain creatures could avoid dying by acquiring voidstone immunity and/or hovering in the center of the room using Ex-flight at the right maneuverability. Also, never really got around to adding any sort of doorway, as to give a practical purpose ot the whole thing.
Perhaps some of the elements are of use here?