your previous thread asked about fast paper ...
using poly contrast filters ( red + yellow ) are about a 1.5x "base" ( non filter) time
( you can test this in your darkroom )
what you might want to do is COAT your own paper with a liquid emulsion
use THIN paper, or use SINGLE WEIGHT PAPER then with PENCIL LEAD retouch the negatives on the reverse side
and contact print them.
( that is the way paper has been retouched ( and FILM ) for 100+ years ... )
it really isn't too hard ... and you can probably pick up
a ROC retouching stand on eboink for 50$ or less...
if you are freaking out about your slow exposure ( asa 1-18 ? ) with liquid emulsion
you need to work with your subject ( even kids ) to tell them what the game is.
shoot bright! overcast days ... even if your emulsion / paper is asa 1
that is 1/15 @ f4 which isn't too bad ...
ilford mg seems to be faster so that is about 60thS @ f4 which sounds about what you might want.
i've photographed people ( adults ) who had to remain still for 45 seconds or more
and kids ( under 6 years old ) who had to stay still for 5 or 10 seconds,
so i don't think 1/15 or 1/60th S is too slow ...
use FB paper so you can easily work the back with pencil.
i'm not sure what the speed of slavich paper is, or if you can get it anymore, but
if you don't want to go the liquid emulsion on THIN paper, it is the only current single weight paper
you will be able to find ... and contact prints from single weight paper are easier than
double weight ...
paper negatives are probably one of the most fun thing there is !
good luck !