Alternative to Overmolding?

Hello all,
I am lead development designer for a new cosmetics packaging (compacts,
bottles lipsticks etc)for a very high profile fashion house. The core
concept of the the look we have been directed to acheive is a clear acrylic shell with a colored inner wall that shows through from the inside. To acheive this effect, the best way we know is to overmold the
two layers and so all design direction for tooling has been to this end. However, the tooling costs that we are recieving from our candidate manufacturers are a little prohibitive. Therefore, I would very much appreciate some input into alternative processes to achaive the colored inner wall effect.
So far, we have considered: spraying - ruled out because hard to control
Separate moldings then inserted: ruled out because fused effect of two materials against each as seen from outside can not be achieve due to reflection from inside surface of acrylic- Any methods to reduce reflection?
insert molding: a form of overmolding, we will proably use in some cases because cheaper methodology but still bond between surfaces can lack integrity
Cubic transfer: won't work because concave area is to be coloured
Our first year production requirements will be @ 100,000 pieces.
Very much appreciate any input,
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