Nice question. The 'Clean Preamp' thread got some good business, but not a lot if anything related to racks.
Good list. Which of those would be closest to the Hiwatt DR103/DR405 sound? Ideally something in a short form (160mm) 1U rack, if I can get it. A big ask maybe, but the Dr. Wattson pedal is small so it's probably doable.
The Kern which is discontinued and the Monique can do Hiwatt. Hiwatt if that means to you a combination of clear hifi and colorful butter. Yep it’s possible. Speed clarity and full warmth. The Summit TD-100 does it too but is missing tone controls. The decaying notes on the Basstasters site review of the Summit show what I’m describing.
While not tube the Glock BAC does Hiwatt too. Different take as it’s SS.
My preference is the Monique. There is nothing tepid about it. It’s big.
Good luck on your search.