I recently released a matrix mixer; not as small as some of the others you mention, I'm afraid, though it does have built in passive mults on all ports which should help save some routing space, or splitters at least.
happy-hardware.com
-- happy-hardware

Hi @happy-hardware...

I like the mults, especially on the inputs!

had aquick read through of the description, but couldn't see hp or power requirements - but I might just be blind!!!

also are the trimmers full height ones - so compatible with the thonk trimmer toppers?

Jim

-- JimHowell1970

It's 18hp, and typically draws sub 10mA at 12V iirc
Yep, tall trimmers.