I breed PCI's but have only had a few generations and do not have a lot of knowledge re colour genetics. If you like the form of your seedlings then I would do the crosses. Personally I love the soft yellows, particularly if they have full rounded petals. What colour is your innominata? I think what you suggest is worth a try, just to see what you get.
If you can get hold of a packet of seeds from Joe Ghio, then you would surely get some lovely blooms. Why not go the whole hog and do both? :-)
Plant your babies in a well drained moderately shady position, with no afternoon sun. Don't water them on hot/humid days. They are very drought resistant (which is good as we are in drought here in southern Aus).
I just noticed that you are in NZ. I could send you some seed if you think they will arrive safely. I have made up quite a few packs of seed for the Victorian Iris society show sale in October. They are basically just a mixture of the ones i didn't want to keep myself.
If you particularly want seed from brown, you could wait and see what I get this bloom season.
Cheers, Jan

Thank you for your very kind offer. In return I share a quote from a recent plant catalogue: 'There was a time when common sense prevailed and the importation of plants was not the hair pulling, weight losing, wallet lightening exercise of absolute frustration that it is today.' (In other words - I'm too chicken to take on MAF ;-) )

I'll give the cross a go (blue, and yellow innominata) and seek out a local member or two of the Iris Society. Not sure if Francis Love is still active but she'd be a good person to start with.

Thanks again for the encouragement.

I'm happy to send the seeds, if you can stand to lose them if they are confiscated. No great loss to me and worth trying the system :-)