try using Upwork or another Contracting Platform and post a job of "Expert Lua compiler consultant needed" with a one-time job fee of $250 (or pick your number)

try using Upwork or another Contracting Platform and post a job of "Expert Lua compiler consultant needed" with a one-time job fee of $250 (or pick your number). Then, filter their available talent by Lua and reach out to 20-50 contractors with Lua in their description, asking if they're interested in this job.