Does Twitter let you use Unicode variations of the letters? If they do, this might work for a while, until they get wise to it.
http://qaz.wtf/u/convert.cgi
โโกโจ โฃโโโข
๐๐ซ๐ฒ ๐ญ๐ก๐ข๐ฌ
๐ฃ๐ป๐ ๐ฝ๐ฑ๐ฒ๐ผ
๐๐ฃ๐ช ๐ฅ๐๐๐ค
๐๐๐ข ๐๐๐๐
โฏโญโด โฏโฃโคโฎ
๐ ๐ ๐ ๐ ๐ท๐ธ๐
etc.