What used to be the case with R. wichurana was (in my opinion) a limitation based on timing of the bloom. What I have seen for four years in my garden is that the (possibly no longer a species) R. wich. blooms very late, as in almost as late as R. setigera.
From this I’d suggest that a lot of the early (1900s) R. wich. hybrids were limited to plant that had receptive stamens and or viable pollen significantly AFTER species first bloom.
What I’m trying to say is that there is a great potential for crosses that can be done with saving pollen from earlier bloomers that wasn’t possible a century ago.