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Depends on the budget...
Cherry keeper or kink3d are a good option for printed/nylon
lori 2b for long term/permanent, can be fully customized but are def not cheap
Hinged base amazon cage like https://www.amazon.com/TERNENCE-Stainless-Chastity-Device-Ergonomic/dp/B07GKVVYQ6 as a starting point can also work
I think you may really like this one. I have the larger cage and this size and they work for me. Get a smaller rig size than the 45 if needed. TERNENCE Stainless Steel Male Chastity Device Ergonomic Design Male Adult Game Sex Toy (45mm M Size) https://www.amazon.com/dp/B07GKVVYQ6/ref=cm_sw_r_cp_api_i_KsNjDbCP4EWFS
TERNENCE Stainless Steel Male... https://www.amazon.com/dp/B07GKVVYQ6?ref=ppx_pop_mob_ap_share
I went back to this one,
TERNENCE Comfortable Male... https://www.amazon.com/dp/B07K13SF32?ref=ppx_pop_mob_ap_share
TERNENCE Men's Virginity Lock... https://www.amazon.com/dp/B07JZ3HN13?ref=ppx_pop_mob_ap_share