No space for shower trap with new grate

G'day. I'm trying to install a shower grate to help with the fall of some big tiles.

The problem is that the shower grate outlet goes into a leak control flange which fits an 80mm pipe. My old shower went to a 50mm trap and then into the old ceramic waste pipes. I now need to go from the large waste to the S-trap without much height.

In other words, the S-trap is almost at the height I'd need for the outlet of the grate without all the larger waste pipe connections. I'm tempted to plumb the outlet without the flange straight into the trap and waterproof around that connector where it comes through the floor.

I wish I could just find a 80mm to 50 mm reducer.

Any suggestions.


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