Get the Vienarasis Mace (and don’t transcend it). Even without gems and only upgraded to +6 (very achievable and almost risk-free) the difference in your output (even as a support SPR Chaplain) would be immense.
Once you’re done with all your pre-farming, trade-out your Vienarasis Mace for a Practonium (and some other things / depends on your server) then make your Skull Smasher. There’s almost no shortage of people wanting the Vienarasis Mace because it’s just that good.
If you’d really rather go ahead with the Reine, you can… it’s your character after all. Don’t expect things to go faster just because you’re giving people +18XX Blessing though. Chances are you’ll be running with people that are still [gearing]. Given that you have the potential to make a Lv315 Prac weapon, I’d say go for it.
In my experience, I carry the party even as a full SPR Chaplain and not the other way around. I hate slow runs.
Sidenote: “Full Support” or as people so fondly call it: “FS” priests shouldn’t exist in this game, everyone is DPS capable despite their best efforts to keep a purely supportive role, you always have something you can do to add to the your team’s output. #notRagnarokOnline #HealBombStillGood