As it turns out upon thinking. 90 wouldn’t at all be the worst pick.
with 1, maybe 2 GSWR liveries, GSR livery, gsr without plate and CIE black (probobly preparing for a fight with that one!)
The loco would make for a suitible shunter on grey and green layouts and even a primary loco on small layout working freight and passenger traffic on a light railway of sorts
we can’t forget of course. 90 ran on the mainline in the 1990s which allows a “Westrail” livery to be quite attractive to those modeling the 1990s IE layouts