After some discussions on the Auxlang Discord server, the diacritic used in the Hîsyêô Latin-based orthography will be changed from the two dots to the circumflex.
cihôû yoûtî xe kôto mût xokôn dîzel hoî boxô yê yôn Dîskôldu et yê hîskûnco yê în yôn nucoto, solwôc yê yogô ûlonfû fos yôn ni hoî bobôun kon cukto yê xûk Letin et yê hîskûnco Hîsyêô, ke dî sûn dûî bindû mût ongôlô xe bono cên.
This change will eliminate the confusion for those familiar with how the umlaut vowels are pronounced, or for those familiar with its usage to denote diaresis, and also in other cases when used for vowel length.
The circumflex is used in some ways which aren't shared with Hîsyêô but there are at least a few examples of natural languages where it is used for vowel height which is one aspect of the vowel shift that occurs in Hîsyêô.
This also means that the dotless i ⟨ı⟩ will not be used anymore because there is no longer a need for distinguishability between ⟨i⟩ and ⟨î⟩. The removal of the dotless i means that the software compability situation for this language is greatly improved.
The Latin-based orthography is still only half of the currently available writing systems. There is a third syllabary that is in development (example above) which will be made available as a free open source font and also provided for all the documentation on this website.