Eli Zaretskii <eliz@gnu.org> writes:

> One possibility is for 'message' to bind 'minibuffer-message-timeout'
> to zero when it calls 'minibuffer-message'.  Would this work in all
> the use cases discovered to day?

FWIW the following patch does remove the delay before {the dabbrev
expansion shows up,TRAMP proceeds with each step}: