No, that dvblast command is only for fix "Continuity counter errors", it works for whole stick (I use it only for DVB-C on 8.90.5), it isn't any special magic thing with that dvblast command, probably there is some missing, kind of activation 'thing' in MN88473 drivers or tvheadend, dvblast just 'push it' to activate it (at last that's what I think).
Unfortunately whole stick have to be visible in tvheadend because otherwise it won't work.