You say "The problem is the benzene in the baking soda which is toxic." I hear people who read some old allegation by Hulda Clark say this.
Have you read the article first with REAL understanding? you may see they refer to USP or pharmaceuttical grade Bicarbonate of soda "Sodium Bicarbonate Injection, USP is administered by the intravenous route"
This is not simple bicarb or 99% bicarb or even 99.9% food grade. They are not using generic baking soda from a dollar store that is less than pure. They are using a product that has in excess of 99.99% and probably as close to 100% chemically free bicarbonate salt as can be measured. Bicarbonate can be manufactured through different processes one natural and one chemical. I imagine if sodium hypochlorite was used then benzene may remain. I imagine also this may be leached from a bleached cardboard box.
I'm pretty ignorant with the whole chemistry thing and perhaps I miss something but I believe they are not using generic baking soda from a box and if it was all that i had and faced with the rapid cessation of the organism due to metabolic acidosis I would use what I had anyway. I effectively used it (temporary effectiveness) when my father had cancer and the hospital did not know to use bicarbonate to stave of acidosis.
Other than an allegation of Hulda Clark referring to isolated cases of benzene precipitate being analyzed from chemically processed low grade baking soda, what is your source that baking soda has benzene? Even Arm & Hammer exceeds the 99.99 percent food grade standard and is consistently tested at 100% there facility is set up to maintain that standard.
EDIT: I would like to have some REAL substantiation of this claim as it is akin to the claim I hear people parroting that baking soda like baking powder contains aluminum. I do not want to be a parrot running around repeated unsubstantiated claims that I heard or read which may just be mere repetition of prior unsubstantiated claims. I would like to be enlightened on whether these claims are true and provided some source. I am open to this should you be able to provide it.