Cheap Substitute for Diaclone Men?

[jaydisc]

After my son checked out my Macross Destroid with the removable pilot, the idea of little men to pilot some of his Transformers is quite appealing. This is now especially the case with his new Universe 25th Anniversary Prime.

Now, I'm fairly certain these were originally meant to have Diaclone pilots, like these, but is there a cheap alternative anyone knows of? Something that can sit in G1 Prime, and other Diaclone based figures?

[GoktimusPrime]

This might help...

Measurements:
Height: 3cm
Width (shoulder): 1cm
Depth (back to front of breast): 0.6cm

Here's a comparison pic for scale: