add mapping for buftype=nofile?

I'd like to map q to bwipe for all bt == nofile, but I'm having trouble finding the autocmd to make it work (assuming that this is the way to go)?

I've tried (transcribed from memory)

autocmd bufreadpost *
\ if buftype == 'nofile' |
\ nnoremap <buffer> q :bwipe<qr> |
\ endif

with various types of events, but I do not seem to be choosing the right events, or am missing something else.

Secondary question, can anyone see any issues with this?

FWIW, I'm trying to make the "q" -> quit convention universal across older plugins (it seems to be a pretty common convention with newer plugins)

Any collective wisdom?

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