Also decided to plug in the numbers for NI just for fun on a similar calculator. Using the numbers from their 2017 regional election:
DUP 10 (+2)
Sinn Fein 5 (+1)
UUP 0 (-2)
SDLP 2 (-1)
Alliance 0
Hermon will hold on easily in North Down, so you can move DUP down to 9 immediately. Enough Alliance, SF and Green Assembly voters will probably hold their nose to keep Alasdair McDonnell in in South Belfast, which would represent a shift of another seat from DUP to SDLP. I suspect both UUPers will be goosed - Elliott if there's an increased nationalist turnout in FST and Kinahan in South Antrim now that Boxcar Willie is no longer the DUP candidate.
The other marginals will be North Belfast - again assuming an increased nationalist vote - and possibly East Belfast.
DUP 7/9 SF 5/6 SDLP 3 Lady Sylvia 1 Alliance 0/1
Of course, it buggers up the talks on trying to get Stormont going again, but did anyone imagine that the Tory Party gave an actual f*** about that?