Ground floor to wall airtightness

[SBMS]

I have made a bit of a sequencing error with my airtightness strategy. I had planned to use a liquid membrane at the ground floor slab to wall junction before the insulation was laid and screed was poured. I neglected this and the 175mm insulation and then a latex screed with foam perimeter was poured. 
 

I am dot and dabbing so wet plastering cant help me. Can I use a liquid membrane to seal the finished screed to the wall? There’s the annoyance of the foam perimeter strip to get over and the plastic sheet under the screed would need trimming right back as currently that’s been left long lapping onto the block wall by couple hundred mm. 
 

Am I good to just try and seal this junction with liquid membrane (soudatight lq prob) as best I can?