Yeast choice for an elderflower grisette

The elder tree at the bottom of the garden is coming into bloom, and I'm planning an elderflower grisette using the flowers.

I'd appreciate some thoughts on the recipe. Note that I'm not too bothered about brewing "to style" (otherwise I wouldn't be using elderflowers), I'm more concerned with making a nice, balanced drinkable beer with flavours that meld nicely together.

Current thinking:
Grain bill, something like 2:1 or 3:1 Pilsner to malted wheat, OG 1.045-ish.
25-30 IBU
A reasonable dose of Huell Melon late boil / hop stand.
Elderflowers (about 1 head per litre) in the hop stand, 15 minutes at 158 C.

Stuff I'm still pondering:
Grain bill: maybe add something to give it a bit more malty backbone, eg sub out a bit of the pilsner for Belgian Pale Ale or Vienna? Maybe add some oats to avoid the whole thing coming out too thin?
Yeast choice - this is the big one. I've not got a fridge and our house is likely to stay at about 69F during the brew, so I'm restricted to stuff that'll work at high temperatures. Obvious options from my regular supplier are WLP565, WLP566, Imperial B56 (= Blaugies?), Belle Saison, or Mangrove Jacks M29. More leftfield choices would be Sacch Trois or one of the White Labs wit or abbey yeasts used at high temperature. I'm after a dry beer but would be concerned about ending up too thin given the OG, so I've got some inclination to swerve the really attenuative chew-through-the-bucket yeasts and I don't really want to get into faffing with brett or bugs. And again, I'm not too worried about getting "classic saison" character so much as complimenting the elderflower and the hops nicely.

Any thoughts?

Thanks!

 

(Slight update: just found out through another channel that fermenting the standard abbey yeasts hot isn't a great plan, so maybe scratch that option...)

 

Thanks for the comments on this. I've got a thingy of "Rustic" as mentioned above, will see how it goes...

 

Wow, this yeast don't hang around - pitched at 5pm, spaffing froth out of the airlock by midnight. Impressive!