Not really post pub nosh
Stamppot is more a hearty Winter evening meal. And using chilli sauce instead of gravy is like making a Shepherd's Pie with chilli sauce instead of gravy - ok, it might work but it sure ain't the same thing any more.
If you can't get the rookworst here, the best bet is to use some smoked Polish sausage which pretty much all supermarkets have these days.
The real Dutch post pub neckfiller is an Uitsmijter (literally "outthrower" - an indication that it's time for your guests to leave after they've eaten it). 2 fried eggs on 2 slices of bread with slices of ham on top. Takes minutes to make and is a most brilliant hangover preventitive.