I used it in a robust porter for the same reason, ended up with an incredibly smooth beer, hence my recommendation.
The harsh roasty notes are the one thing from some stoats that challenge me, and put my wife off dark beers completely. She LOVES my chocolate orange porter though, the first properly dark beer she's ever said that about.... All because of the lack of the harsh roasty notes.
All without faffing with cold steeping grains etc.
In regards to Munich malt, I use Munich in every beer I brew. However, if you use Maris Otter as your base malt you need more of it to notice any flavour difference, basically because in smaller quantities the flavour that Munich adds is already present in Maris Otter. You notice it far more used alongside much paler malts, like a pilsner/lager malt, or with malts that don't have toasty/nutty in the profile. Or just use more of it. I also bought myself some dark Munich, as the darker the Munich, the stronger the effect you get from it. It's brilliant in a porter...
I'm nuts about porters, you may have gathered, and am slowly working towards building 2 or 3 grists to use in different recipes, experimenting with different quantities of of dark munich, chocolate wheat, pale/normal chocolate, and I'm going to be trying brown malt in my next one too (for the record, I tend to think of my stout's as porters too, as at the end of the day what we call stout today was a stout porter....), as well as golden naked oats.
There are so many malts to experiment/play with, finding styles that allow some experimentation just lets you really have some fun! To me, porters (including stouts and bipas) are now my Saison for the colder months... The perfect beer to play with, with little risk of ruining it.