If your flower is unique (and it appears to be at first glance) it is worth registering. The expense is $ 10...... and the time and effort amount to downloading a form and filling it out, taking pictures and sending it in, Half an hour, tops. But - if it was me I would at this stage just reserve the name and take your time, waiting for successive blooming cycles to make a final decision.
David the Tetrio Pseudo Sphinx Moth is the pollinator for Plumeria, but Thrips sometimes do the work too.
