FYI - I've added a new block to the SUS SVN at SUS/common/models/

Adding         SIXOSEM_T_ESTIM_STAGE_MASTER.mdl   - this is simulink R2019a
Adding         SIXOSEM_T_ESTIM_STAGE_MASTER_tmp.mdl  - this was my working file in R2023b
Committed revision 31074.

These are a long way from done. This will be the new piece for the OSEM Estimator part for the HLTS (PR3)

The ECR is https://services1.ligo-la.caltech.edu/FRS/show_bug.cgi?id=32526