I know I'm entering the party late but wanted to add my own anecdotal evidence.
I was an exclusive 34/70 guy for my lagers until my last batch. I completely agree that Diamond expresses the flavors of the malt and hops better.
My German Pils was absolutely fantastic and will not be switching...
Generally with fruit additions they say to add a pound/gallon.
My recommendation would be to add your purée into the keg and put the cold crashed beer onto it and you should get some decent flavor additions without having to worry about refermentation.
OTOH you can stabilize the beer and then...
Personally, I would go with WLP 001. It's a clean yeast and with American Wheat's you want a clean yeast profile.
I've had success using S04 as well in case you want to try a different yeast next time.
Personally, I wouldn't blend...especially since the 080 is already a blended mix of ale and lager yeast.
I'm a big fan of British Ale yeast in cream ales/blonde ales myself so I can definitely see your dilemma!
Good luck!
I like doing German Pils/Kölsch. Can be fermented around the same temps (i only have one fermentation fridge) and taste completely different.
I also like doing my American Wheat beers with WY1010 and SO4.
I've done Alt and Vienna Lager and Lithuanian Farmhouse Ale and Lager Yeast split.
Each...