I already devise an alphabet to write Ossetic (Iranian Lang.), Abkhaz, Adyghe, and other caucasian language including ubykh (they are currently use Cyrillic). My goal is to use minimal diacritics, only use one diacritic and have clean look. Any suggestions?

Currently Latin script for ossetic is complete.
Sample in Ossetic:
Адӕймӕгтӕ се 'ппӕт дӕр райгуырынц сӕрибарӕй ӕмӕ ӕмхуызонӕй сӕ барты. Уыдон ӕххӕст сты зонд ӕмӕ намысӕй, ӕмӕ кӕрӕдзийӕн хъуамӕ уой ӕфсымӕрты хуызӕн.

Ȧdaymagta sė 'ppat dar rȧygwerenc saribȧray ama amxwezonay sa bȧrte. Wedon aххast ste zond ama nȧmesay, ama karadziyan qwȧma woy afsemarte xwezan.

Sample in Abkhaz:
Дарбанзаалак ауаҩы дшоуп ихы дақәиҭны. Ауаа зегь зинлеи патулеи еиҟароуп. Урҭ ирымоуп ахшыҩи аламыси, дара дарагь аешьеи аешьеи реиҧш еизыҟазароуп.

Darbanzaalak awaywe dṡoup ixe dakwitne. Awaa zėg’ zinlėi phathulėi ėiqaroup. Urt iremouph axṡeywi alamesi, dara darag’ aėṡ’ėi aėṡ’ėi reipṡ ėizeqazarouph.

Interesting. How widespread among the Caucasian family are you planning to propose this?

Maybe all the Caucasian family except Georgian. Georgian has already have their own unique script...