I'm not the player to help on this one - I haven't got blue roses or purple pansies after 5 years of playing - well I haven't really tried.
Stitchmaker often talks about a blue rose breeding guide on YouTube which worked for her - PM her, she possibly has linked to it in past posts.
Ehingen Guy has posted about hybrids - but not sure he has written a guide, both are members here on BTF.
The only things I remember (or what I would do) is take what I hoped were hybrid reds & place them into breeding trios (maybe, I've seen spacing posts - maybe by Jon_Snow?) & put fertiliser in a space between them.
Make sure you remember the pattern, so any reds produced by those hybrid reds, you take out as they won't be hybrid reds themselves (I think). And hope for the best.
Purple pansies I'm blissfully ignorant.
I've never bought flowers, but as you say, hacked flowers do not produce hybrids just their parent flower/s.
You can ask & get non hacked ones, if I was asking I would ask here on BTF - as blue roses breed well (apparently) between themselves, you would only need 2 starter ones.
Edit: a blue & purple theme - I've done something similar with violets and pansies - blue pansies are easy; white/purple violets get from butterfly/gardening tours and they easily produce blue violets. Purple roses are also easy - so as an interim you could set this up. Still takes time tho.