Neloth misc quest

[Elthrael]

I'm trying to complete every quest and Misc quest in the Dragonborn DLC and I can't get Neloth to give me the misc "Experimental Subject" quest. It's the "B" variant, as noted on the wiki.

I've completed the first one, the proper side-quest one, where he gives you a health buff that turns into a debuff if you get wet. I've completed all his other quests and I've completed the repeatable Azra's Staffs radiant quest three times, which is listed as a prerequisite on UESP wiki.

When I get the dialog prompt "Can I help with your research?" he only gives me the repeateable Heart Stone and Azra's Staff quests. I've finished the DLC main story and the base game.

Any idea why he won't give me the quest? Or how to just add it via console? I've tried StartQuest DLC DLC2TTR4b and SetStage DLC2TTR4b 100 and ResetQuest DLC2TTR4b.

I've even tried messing with the dialog console commands but I'm not sure I know how to use them properly.

Although reading the wiki again, the quests have an "A" and a "B" variant and in the "A" variant's description, it says that the "B" variant is the "alternative". Is it possible you only get one per playthrough and the other is forfeit?