I can't imagine Brodin is available without Spooner or Pasta being involved.
Brodin is an elite 4 way skater with excellent hockey IQ. He is younger than Spooner, already playing at a 2/3 level and has tools to improve offensively. If he can improve his offensive zone work, he can be a legit #1D.
I can see maybe being able to pry Dumba away without Spooner/Pasta, although he is basically a Colin Miller with more upside, so I'm not sure if that's the best use of assets unless you include Colin Miller in a different deal.
Really, though, I don't see how a deal with MN isn't 1st + Tuch/Ek/Olofsson and these Dumba/Brodin things are just fantasy. Of course the Bruins were scouting a MN game so who the hell knows.
Like Brickley, I think the east is so wide open. If the Bruins sell Loui, I want a second move where they improve the roster at D before the deadline.
For fun...
Eriksson + BOS 1st for Dumba 
SJ 1st + Colin + Koko for Buff
Beleksey Krejci Pasta
Marchand Bergeron Connolly
Vatrano Spooner Hayes
Ferarro Kemp Rinaldo
Talbot
Chara Buff
Krug McQuaid
Seids Dumba
Morrow KMiller
Dumba is your Hamilton replacement. Buff is your bridge to Dumba, Zboril, Carlo, Lauzon. There is enough cap space to resign Buff and add a middle six winger in the offseason. Chara and Seids will be off the books in a couple years so if Buff does fall apart, you can handle the cap hit. You lose this years 1st rounders, but you are set at C and D and your best prospects are all wingers.