If you have a significant amount of bitcoin that would hurt to lose, look at a service like nunchuck.io #nunchuk. Also look nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl for complete true open source signing device to add to your coldcard multisign setup. trezor and bitbox can #gfy (with all due respect to nostr:npub1tg779rlap8t4qm8lpgn89k7mr7pkxpaulupp0nq5faywr8h28llsj3cxmt)