True seeing is not a problem, you can swap to
lenses of woodsman , that also have some seeker too, so not a big lose swaping from mentau googles when needed. About seeker items I didn't change your cloak setup, so can still use the wolf cloak if want, so is only -2 seeker difference from consuming darkness, another possibility is using a +10 wise cloak of something if want more wisdom for 10k stars but 1 or 2 points shouldn't make much diference. Even with +5 seeker I don't think you can match 7 dmg on every hit that works on almost any enemy while seeker suffers against fortified enemies that have lower chances of crits. The intercession ward is cool but only useful on few quests with quells so is easy to swap gear for those quests when needed.
The biggest trade off is the positive spellpower (around 33 asuming a +15 heal augment), and around 16% heal lore, that is not much big deal, except maybe when tanking, but we are talking about a dps mode here. So I think it depends on the mode you want to play but from a dps perspective I think the santicfied gages are hard to pass, considering the amount of hits of this build that is fully ranged and doesn't take too much dmg. But in the end will be hard to say if +5 seeker and 1 extra wisdom (or +2 seeker and 3 extra wisdom), does more than 7 avg damage per hit all around.
Some math
(Asuming you are playing on Dreadnought in the best conditions with no fortified enemies and confirming critical rolls always: from my understanding +5 seeker does: ((+5seeker dmg*4critical multiplier*0,1(rolls 19-20 or 10%))= 2dmg) + ((+5 seeker dmg*2critical multiplier*0,1(rolls 17-18 or 10%)= 1dmg)= (2+1)= 3 dmg on hit. On shiradi would be even less. So It would depends if +1 wis is more than 4 dmg per attack, but that is tougher to tell. Against fortified enemies that 3 dmg per hit is even less.
Note that I don't know how much that extra seeking bonus is helping to confirm critical rolls that otherwise wouldn't be confrmed, if for example you were confirming critical rolls 70% of the time before that seeking bonus and after that bonus you are confirming critical rolls 80% of the time, that is a 10% more criticals that should have to be taken into account, in that case, asuming a 100base dmg*0,1(or 10%extra critical confirmation rolls)*0,2(20%critical chance) = 2 extra dmg that should be added to that 3dmg*0,8(80%critical roll confirmation)= 4,4 more dmg. So it also depends on how much that extra seeker is adding to the critical roll confirmation chance.