Is there any hybrid with rajah?

except for some natural hybrids like:
kinabaluensis
alisaputrana

fallax x rajah.
why EP and BE not making any hybrid with rajah?

some hybrid that we can grow as an intermediate is ventricosa x rajah, truncata x rajah.

i don't know why, if anyone know why please tell me.

i also know that it may take up to 100 years for it to reach maturity.