The woody fruits that Witch Hazels (Hamamelis) produce usually have two or four seeds in them. I've looked. This will be a drain on the plants resources of course.

Also, as the shrubs get older, they produce less vigorous growth and so less new wood with flower buds. I would mulch heavily with plenty of compost and give a heavy dose of slow release fertiliser too such as Vitax Q4. This should help it if done over a few seasons.

Just reread you enquiry. Catkin-like flowers?

I wondered too about the description of the flowers.

Wonder if Guest means a contorted Salix.

or even a proper hazel as they have catkins.

...and nuts.

Ah well we'll never know as Guest can't respond...

unless they join us proper. after all it is free.