I’ve paired my LTWOO brifters with Campagnolo calipers. Works great. I used the Campy pin and olive on the caliper end of the brake line. Those are virtually identical with Magura so I’m sure that Magura calipers would work as well. In fact I’ve paired Magura MT8 calipers with Campy Ekar levers on my gravel bike. And the LTWOO hydraulic units in the brifters are basically Campy copies. And I’m quite sure you could pair the levers with Shimano calipers as well.
Good to know. I'm about to do the same with a Wheeltop group, for the weight savings. Its on an sl8 replica, so dual Ekar calipers for me (they're identical to the 140 road calipers) with the unique 160 adaptor up front. Folks have used both the Shimano and Campy pin and olive when doing Shimolo, but I was going to do what you did, Campy at the caliper end. Were you able to reuse the same hose?