Looking for advice for Primordial Jade Winged-Spear

First of all, I'm a new player, as well as f2p. I've been playing for a week and a half at the moment.
My functional teams consist of Zibai/Aino/Illuga/Gorou and Keqing aggravate/Elemental reaction.
Obviously within this timeframe, my units aren't even close to being maxed outside of artifact sets on some of them.

Last night, before the patch, I did a single on the story banner and pulled this weapon.

My plan for the future was pulling for Varka and potentially his weapon, due to them being a very good package for Hexerei characters, which would bench my Keqing who's a bit behind.

But due to my current circumstances, and not wanting to leave a nice weapon on the side, I feel like I should pull for Flins...
The problem is that I don't have any hydro support that would complement him aside from Aino, who's currently a staple in my Zibai team.

Xiangling is geared for bursting and staying off the field.
Illuga is always off field, although I will mention that he's c6. Idk if that encourages giving him the weapon and using him more on field in-between rotations(which don't really have much downtime to begin with, due to excess ER on my supports and Zibai).

The only polearm unit that's worth mentioning in my roster would be Yaoyao, but she's really not fit for physical attacks..

I'm just looking for a way to use the damn weapon, so I'd appreciate any advice.
If I went for Flins, what would be a good budget hydro support for him? I have Sucrose/Lanyan and Fischl that would be fine in a team with him. I didn't choose that hydro sword user from the free 4 star event, so that's kind of a miss now, but I don't regret Lanyan.