The Sun has reported that Julie Goodyear who played Bet Lynch, wants to return for Betty's funeral when it takes place. It will most likely be for one or two episodes only, but it'd be fitting as the pair served behind the bar together for many, many years.
I think it'd be great to have as many people as Betty knew to be back for her in-show funeral, not only would it feel more realistic to have so many of Betty's good friends back on the show, it'd be a great dedication to Betty Driver to have so many people return to the show to wish her character farewell.