If you can set a custom dictionary in your keyboard, or set autocorrect phrases, you can set b to show the option to be autocorrected to ₿. Thanks to @BitBees for the tip. https://i.nostr.build/2jP9.jpg#m=image%2Fjpeg&dim=1080x568&blurhash=i26%40f%2C%7EW%252R*NGj%5BayRjIo-%3A-%3BfQIUIoRjayRjNGJUxtWBIoNGR*jsWBWBWCs%3As%3Aofofj%5BfQWCWB%24ME1NGt7t7s%3Aj%5Dt7t7&x=806798bbf308be2ed3ae5320eeb6c44cfe11d2a4b72094e4b7a28552145d7979 https://i.nostr.build/LRE6.jpg#m=image%2Fjpeg&dim=1080x543&blurhash=i05q%5El-p%25MxuD%25-%3BRjM%7B%25M00%3Fbxu%25MWBs%3A%25Mt7E000IUM%7BIU%25MNGRjj%5BIU9F9FkBRj-%3BRjIURj%3Fb4nRjofof%252RjR*ay%25M&x=535b665788ea2105491274f58062f97d16b654bbfb8ba133b5116c13f82e6758