The best alternatives to #thread-to-channel are Slack, thready, and Reply Later. If these 3 options don't work for you, we've listed a few more alternatives below.
Shipped is the issue tracker built for teams that love Slack. It encourages teams to have open discussions in issues while maintaining the fast response feeling of a Slack 1-1 conversation.
Collaboratively resolve issues with a simple interface, seamlessly integrated. Facilitate 3D reviews and tag issues directly on the model with work instructions that update as the model changes. Capture issues from any device in a fraction of the time!