Sorry for replies late, on the previous Spa court had 1500 mm. w. and 150 mm. of riser this is main and disable stair. (handicap can be used.)
In regulations defined the main stair at least 1 stair per 1 tower (public bldg.) can be run from the ground to last floor.
Therefore you can designs the main stair mix disable and fire stair on 1 stair 1500 mm., you can have only one stair at 1500 mm. and the rest at 1200 mm.