Just for the record; this snippet was indeed all that was needed to update ggseas to be ready for ggplot2 2.3, and it does continue to work with ggplot2 2.2 as well. So thanks, this has saved me what I thought would be a much harder struggle with tidyeval.
And noting that it is quo_text not quot_text.
#' @importFrom rlang quo_text
as.character.quosure <- function(x, ...) rlang::quo_text(x)