The EPIRB is dealing with a different issue than the LifeTag system. One is a general catastophy on the boat that will summon shorebased help, i.e the CG. The LifeTag deals with a unnoticed MOB
and will summon help from the boat. The PLB is basically a smaller EPIRB. Since you are within VHF
range for this trip, not sure that a full EPIRB is called for (always nice to have). If I was looking at an electronic system to deal with MOBs, then I'd look at the newer ones that issue AIS
SART/MOB alerts. These show up on your AIS
display as well as nearby boats.
Focusing on ensuring that the crew is will harnessed and tethered in is far more important than having items like the Lifetag. In bad conditions on a Mom and Pop boat it is unlikely that you will successfully accomplish an MOB
recovery. Stay on the boat - tell the crew to stay on the boat.