Any flowering type plant that can survive amongst quack grass?

I have an orchard of mostly quack grass.  I tried adding english daisy plugs this year that I started from seed, and I think they are surviving but I haven't seen flowers yet.  Anything else I could mix in like that w/o having to kill and rototill the whole thing?

ox eye daisy
black medic
red clover
white clover
salsify
dandelions
asteracea spp
astilbe
comfrey
wild chamomile (in bare spots)
plantago
knapweed
horsetails

I'm not sure how big your orchard area is. But if you have entrenched quackgrass, it may well be robbing your trees of moisture and nutrients.

I find that long-established quackgrass forms two layers, surface and deep. At that stage, its competitive abilities are substantial. I don't know a plant that will out-compete quackgrass. I like the idea of clovers, but I'm skeptical.

Mechanical eradication in a small area is possible, but you really have to want it. That means digging and pulling the roots and rhizomes by hand.

What I find is that its impact on trees can be managed by harassing it so that it can't form the mature two-layer mat over the tree's root zone. It's much easier to pull out root clumps and rhizomes in spring, before its fine root hairs grow.

I guess this is rather off topic, since it doesn't directly answer the OP. It's just my 2 cents, as a scarred veteran of the quackgrass wars.