Why not make your own on-screen buttons by yourself ?
Check out this easy user-friendly tool for windows users:
Automated Framework Kit by Themike10452
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Post #2 > OSB for SJBX v4.0 (4.2.2)
Post #3 > OSB for SJB v5.0/5.5/6.0 and v8 (4.1.2)
To disable on-screen buttons you should add this to build.prop