Well, I hope LMB will agree with me, but it seems to me that on Beta and Escobar embryo transfer to a uterine replicator was a standard procedure, with a very small risk, when performed at the appropriate time. Remember Cordelia was on Barrayar where the technique was new, and transplant was an emergency, after soltoxin poisoning. Granted, in case of rape early in the war, transplant could happen later than in the normal procedure, and with women weakened by months of captivity, but still by escobaran surgeons in the best (one would hope) hospitals. The risks should have been less than to Cordelia. Soltoxin is nasty stuff.
Where I share your question, however, is on psychological aspects. Results of rapes or not, those children were, for half their genes, Escobarans. That the raped women would not want to keep them makes sense, but wouldn't the escobaran society, as a whole, want to keep them (adoptions, or government care) rather than send them to benighted Barrayar?
Human is as human does....Animals don't weep, Nine
LMB, The Labyrinth