I wonder, do the RIR's "talk" to each other about UI?
I'm in the middle of duplicating (moving) a bunch of route objects from 3rd party IRRdbs to the appropriate RIR ones, which, so far, has meant creating route objects in the RIRs run by APNIC, ARIN, and RIPE.
User experience-wise, I'm sad to say RIPE rates last so far.
I figured out how to talk to ARIN's API first so creating objects wouldn't have to be a whole bunch of point&click&paste. It "works" and accepts rpsl format text for objects.
Next I did some APNIC route objects, and was amazed by their route object import tool. It looks at presumably a full view of the Internet and offers to auto-create route objects for your prefixes found in the table...including a checkbox for "would you like RPKI ROAs with that?"
Finally I got to RIPE. No auto-import tool. There is an API, but it doesn't accept data in rpsl format, so if I want to explore it farther, I'll have to write something to convert rpsl route objects to either xml or json.