I have used this combo(Ilford WT RC paper and Ilford WT developer) and it will give a WT look. Will it be sepia and will it have strong blacks? Depends on how you define these. Is this sepia as in subtle warm brown? If so yes but my idea of a tendency to sepia may differ entirely from yours. The blacks will be warm blacks and as strong as MGIV blacks but not the same

What it will be is noticeably warmer than MGIV and in a brown as opposed to a yellow brown which some define as sepia

Give it a try and compare it to MG dev with MGIV paper. If there isn't a difference that you can see then I'll eat your hat. It's too cold to eat mine here in the U.K.