Yes all of these pinks are hard to find and hard to grow in general.

Beni maiko is a red/pink variety that might be easier to find...but probably not easier to grow.

I have seen pictures of 'baby lace' that had pink tones as well as 'baldsmith' (although I'm not sure which time of the year, and I don't think they are the bright pinks you are referring to)

'pink filigree' is a dissected cultivar that I have not seen in person, but seems to have quite a flush of dark pink tints.

'coral pink' is another option...but probably hard to find.

'oridono nishiki' (aka 'orido nishiki') is a variegated culitvar similar to 'butterfly' with pink variegations...but it usually has more variegation than 'butterfly' IMO.

'goshiki kotohime' is a multicolored variegated dwarf that can have new growth that appears pink IMO.

'wilson's pink dwarf' supposedly a nice pink spring color.

'marakumo', 'masukagami', 'karasu gawa' are other pink cultivars (variegated I think) that are probably harder to find than the ones listed above.

'shin deshojo' may be too red for what you are looking for but the color is great.

'shaina' is supposedly a red witches broom but I have seen pictures that had quite a pinkish purple color on some of the leaves...and I believe this was during the summer instead of spring.

Note that I'm not familiar with hardiness on any of these...since I live down south where we only worry about heat.
But, maybe out of some of these you can find a couple that suit your fancy :)

I have a Wilson's pink dwarf- it leafs out early so it is susceptible to frost burn. I had a little one gallon last spring that bit the dust, but was fortunately able to exchange it for a larger (and hopefully hardier) size. The leaves are just starting to unfurl now. I saw a full grown specimen last year in spring and it was a brilliant, beautiful shrimp pink.

My oridono nishiki has lots of pink on it and I find it quite beautiful.

I have another cultivar called Asahi Zuru which is supposed to flush pink in the spring, similar to oridono nishiki. However, my specimen is fairly young and I have been told that it simplly needs to mature more. It barely had any pink on it last year, so we shall see what it looks like this season.

The shin deshojo is a beautiful dark pink/coral color that holds its color for quite awhile. It's very pretty and also looks good in the fall.