I'm glad to note that there are a lot more reverse edge makers out there than their used to be, but nearly all of them are custom order.
Shivworks China-Pick and the Spyderco P'kal are the only reverse edge optimized blades I'm aware of that are production.
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In terms of custom - Well I just tore through my Instagram follow list:
Ban Tang
Joe Watson (who is retiring from knifemaking, so probably out of the running at this point)
Tom Halloran
JB Knife and Tool
Dirk Pinkerton
GMoffatt Knives
Kramer Custom Knives
Iron Side Edge Works
Tony Lopes Blades
Karambit Maker
Ken Brock (Brock Blades)
Sosby Blades
Trin Blades
Red Meat Steel
Shuhari Knife and Steel
Kopis Designs
Martel Blades
Echo.Delta.Charlie Knives
BGM Knives & Metal Works
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I'm sure I missed someone - but that's the list from my IG Follow of makers who have or do build pikal/reverse-edge knives.