Unfortunately houseplants are not reliably listed in the RHS Plant Finder, as stocks offered in garden centres tend to be sourced abroad making it difficult to identify availablity.
Also the range of available Hibiscus rosa-sinensis cultivars is continually changing with new introductions and so it is difficult to make recommendations but the Old Walled Garden Nursery lists a good range of cultivars.
For a variegated form, consider;
Hibiscus rosa-sinensis ‘Cooperi’ (v) AGM: Compact plant with heavily marbled olive-green and white leaves, sometimes tinted pink and bearing red flowers, height 1-2m (3-6ft)
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