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OP,
I would consider the offerings from Area 419. Though not intended for this rifle, their CZ 457 rail in 50MOA is a quality unit.
I believe they offer 20 and 30MOA as well.
I have owned Warne steel and BKL alloy rings. The Warnes while nice had a machining flaw. When sent back, they returned a simpler (downgraded) set. The replacements were perfect, and I’ve never had to touch the scope adjustments in over 10 years, still, it bugs me.
The BKLs were a disappointment. They are a simple extrusion that had been bead/sand/shot blasted. No where near the quality of anything else I’ve used.
I have purchased a set of BKL adapters (11mm to Picatinny) which seem to have more bearing surface, and would be less likely to slip compared to the CZ adapters.