To all:
I have discussed my lack of mechirat chametz with three different rabbis and they all endorse it enthusiastically! The bliah in the kelim is of no value to anyone (so selling it makes no sense), and the biur chametz takes care of any potential issur.
Ideally none of us would sell any chametz; mechirat chametz was a post-Chazal kula (based indeed on sound sources within Chazal) intended primarily for merchants who faced financial ruin if they had to dispense with their entire inventory. I’m not a merchant so I don’t need to use that kula; instead I do the l’chatchila and get rid of all my chametz.