Encode 50 million - Roman Numeral - Best practice

This should be the 50,000,000 symbol, a capital D flanked by 2 vertical lines and surmounted by 1 horizontal line.

4 character entries seems terribly convoluted, perhaps better than PUA for forward-facing accessibility?

• 007C VERTICAL LINE
• 216E ROMAN NUMERAL FIVE HUNDRED
• 0305 COMBINING OVERLINE
• 007C VERTICAL LINE

Any suggestions for a better approach? I cannot find this in unicode.

Thanks