I know all eyes are on Kovy now, but I think the Bs best bet could be Senyshyn coming back from injury. The chemistry he had with Coyle and Bjork looked really good the 4 games he was up before injury. With Kovy you have to hope he can gel with the line, but with Senyshyn you already have that small sample size to show that he does gel on the 3rd line.
Here, not going for Kovy, I think you could rotate Heinen and Bjork if needed, and potentially even drop pasta to 2RW, Bjork 1RW and Heinen 3LW.
**EDIT** As soon as I finish this the Bruins assign him to the AHL off IR. Most likely for rehab, but could also be not wanting to put anyone on waivers at the moment (with Bjork being only waiver exempt player)