If Barnabas wasn't a playboy how would he know what to do to cause Angelique to still want him after 200 years?
It's funny how that never seems to be discussed in fandom - but chances are extremely good that it has to be true for Angelique to still speak of "those nights in Martinique" for centuries afterward!
we haven't heard a peep about a sarah collins, have we?seems like that subplot is getting dropped.
given the plot outline i don't think it's necessary...or perhaps even advisable...to have any of the "present time" actors portraying joshua and naomi. they're obviously going to be minor parts so that casting might confuse new audiences not familiar with the traditional turn of events. besides jonny lee miller is too young to effectively play the pompous, blustery joshua and there's a pretty significant age difference between him and pfieffer in terms of husband and wife.
perhaps having angelique be the one to entomb barnabas is simply more expedient given the time frame of a movie versus a series. the storyline appears to be set largely in the present(1972)so the whole story of joshua's reasons for entombing him might be too lengthy to get into.