I'm not sure what you're asking. Are you asking whether you can run the Shimano hydro levers with the brake inhibitor disconnected, or whether you can buy hydro levers with brake inhibitors, or whether there's a way to run brake inhibitors with your new Shimano levers?
The first is easy. If you unplug your mech levers from the controller, and the bike works as desired (no inhibit), you can run it that way with your hydro levers.
I'm not sure about an ebike hydro lever that'll work with your system, but there's a product to add inhibit to your hydro levers. I've never used it and don't know how available it is, but here's one source. https://em3ev.com/shop/generic-ebrake-sensor/