I tried to test the scim/scim-bridge gtk-im-modules for 64bits applications, however, the gnome applications on Solaris are 32bits, except this one,

/usr/demo/bin/{amd64,sparcv9}/gtkdemo.

Unlike Linux, which has different distributions for 32bits and 64bits (for both kernel and userland), Solaris ships them together (the default loaded kernel is 64bits).