Do you want just the dotless i or do you want a full Gaelic feel? For the latter check e.g. the external links in
https://en.wikipedia.org/wiki/Gaelic_type
I don't know if any non-decorative font has a dotless i by default, or maybe as an OpenType option, but it should be relatively easy to modify a font and remove the dot. There's also a specific dotless i character that is used in Turkish at least, you could use any font that supports it and replace all your i's with ı's (although it will probably break searching, etc.) If modifying a font, you could just replace the "i" glyph with the "ı", which should be even simpler than removing the dot.
You may find what you want searching for fonts for scholars or medievalists, like Junicode. Apparently
Alphabetum offers a stylistic alternate for dotless i.