For the flowers you mention, air-drying won't work (doesn't work for almost any monocot except grasses and freesias) and drying as an intact bouquet with silica gel strikes me as very difficult (although we don't use it as a rule, and experts may have a different take on this). But there are shops that specialize in freeze-drying wedding bouquets, and I think they could produce the results you're looking for. The link below lists two in Connecticut, and a search for "freeze-dry", bouquet, etc. will produce more. It isn't cheap (freeze-drying is actually a slow process, and the equipment is expensive), but professional-quality results with silica gel aren't necessarily cheap, either. I'd suggest visiting the shops you're interested in and looking at their results.

Here is a link that might be useful: Some shops that freeze dry wedding bouquets

Thanks for your response: I did do a web search on freeze drying, but my stepdaughter didn't want it: the cost is between $100 - $500 depending on the size of the bouquet (and hers is big), so would rather have me try - if it fails, it's not the end of the world.

Thanks for the input though, especially on unsuitability of the flowers for air-drying.