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Ha, yes this was my exact use for the red kite zumi, it does work, it's not amazing with a buggyboard (ie not as good as a reversible seat pushchair) but it's okay. I had a bjcmgt with a board, which I really didn't get on with that very well at all, the normal city mini is very awkward with a board. Do able but not much fun if you want to use it often.
I found it quite hard to find something fairly compact when open (also wasn't bothered about the car or folded size particularly) but robust enough to take a board and still easy enough to push and steer. I had a britax b motion with a board for quite a while too. That was alright, bit heavy to turn though.
A new Oyster 2 - and get the air tyres for it given you walk loads. I would sell your Lascal board and get an Oyster Ride on board The board folds up when not needed really neatly. The handle will push in on public transport. The new Oyster 2 seat is huge (better than the old Oyster seat).