Reporting back:
- SQ checked bag through to EI, no issues whatsoever
- CDG: apparently SQ and EI use the same satellite (11-18 gates) - at least today this was the case
- simply went through security after getting off the SQ flight (had done OLCI); took max 5min in total
- found myself in the gate area before 8am, was the only passenger there (EI departure 1020am); coffee shop opened around 830am
- transfer desk manned around 60min before departure (info on bag coming from SQ added; also checked in my cabin bag)
Everything worked well.