Connecting sink into toilet pan pipe

[Danzka]

I have a steel beam that prevents me from getting my ensuite 32/40mm waste below floor so am considering running 1m in the wall to the inwall toilet pan connector (90mm diameter) before it goes below floor.

I know a branch T is better (as it cannot block) but I cannot fit it in, so would it be a bad idea to fit a 90mm/40mm reducing T (pic below) with a 32mm reducer? Would the reducing T incur blockages from the soil waste streaming past? My thoughts are that it is only a 32mm hole and the angled side of the reducer (see pic) should deflect it onwards rather than 'catch it'.

Any thoughts/advice on this would be welcome.

 

[ShaunCorbs]

Picture of said toilet pipe please

 

[Danzka]

Picture of said toilet pipe please

Thank for taking a look 🙂.

Proposing to put reducing T in here (as per finger point) with 32mm pipe entering from right to left

 

[ShaunCorbs]

Where does the soil pipe run from there as I wouldn’t tee there will cause vacuum issue / pull the basin trap