No guarantees from me, but I just did the reverse a few weeks ago. I took a newly purchased blooming phal that was in bark and potted it in sphagnum, which seems to be better for my conditions. The original blooms were having problems which pre-dated the repotting (they didn't open all the way, but they didn't die either - kind of like semi-bud blast.) Anyway, I cut the spike back to the next node a week or so ago, and it sprung a new spike from the node just yesterday. I know I've read not to repot a blooming plant, but (maybe because I've never been called a rule-follower?), I've done it more than once with no apparent ill effects.