Make a genuine case for why someone is the younger brother of Jesus Christ and why that means he should rule over the landmass formerly known as Ch*na. If you're going to dress up in little soldier costumes and have little flags and pretend the ROC is real, you may as well have fun with it.
Bringing back a specific dynasty would also suffice. Be a Song Dynasty Guy and demand we bring that back. Just see what it would be like. We all know you just want to wear a little costume and they had much better ones than the Taiwanese military.