Bathroom waste plumbing - change of track - thinking out loud

[RichardL]

Previously to prep for a room conversion I had the toilet waste extended to allow another loo/bath/basin etc.
At that point - the idea was to put a trench across the concrete foundation slab to connect into the bath/basin waste - hence the 45º blanked off below floor level.
Soil pipe across is for a toilet, and vertical to allow appropriate high vent/one way air intake etc.

This whole area gets boxed in to ceiling hight in due course.

Changes
I'm now thinking more to leave the slab alone and run the basin/bath waste around the room, to be boxed in, but arrive at this area at approx floor height.

Question
What options do I have for plumbing the bath/basin waste in?
I'm thinking another strap boss on the upturned/curved soil joint? - to face along the wall to the right?

...am I missing an obvious option?

Many thanks for any insight.

Edited October 30, 2022 by RichardL
Update pic