A good question....
re degree of roasting:
I dont change anything when going from one method of brewing to another. I like all my "espresso roasts" as brewed in the plunger and besides, because the infusion method is a much "weaker" form of brewing that extracts a lot less out of your grinds, it is counter productive to for example, roast the beans to a lesser degree, where in the plunger this would result in you extracting even less out of the lighter coloured grinds.
And I dont go roasting any darker either, because I dont like burning coffee.
Re type of beans / blends...
ditto, they are all there to be appreciated, and you cant account for their different tastes as individuals until after you have given a selection of coffee and they tell you what they liked and disliked.
So....dont change anything, & let them appreciate your proudly produced roasts just they way they are!