Any way to type IAST (Indic in transliteration) in iOS?
IAST (International Alphabet of Sanskrit Transliteration) is the standard method used by scholars to write Sanskrit and other Indic languages in Latin script. As Sanskrit has more phonemes than the 26-letter Latin alphabet can cover, IAST makes use of a number of diacritics to precisely represent e.g. short and long vowels (a, ā) and different versions of consonants (d, ḍ, t, ṭ). Numerous Sanskrit words are commonly written in English without these diacritics, but serious students prefer to write them with, e.g. "samsara" is actually saṁsāra. (The ṁ represents a nasalization of the first syllable, which in this case is pronounced like the French word sans; there has never been an "m" sound in the Sanskrit word saṁsāra.)
In MacOS, these diacritics can be added using the option key with the ABC extended keyboard, but of course there is no option key in iOS, and while some of the modified letters (like vowels with macrons, ā etc.) are available by pressing & holding the letter, others (such as the dot-under consonants ḍ, ṭ, etc.) are missing. I understand the latest versions of iOS allow installation of third-party keyboards; I looked in the App Store, but didn't see anything that looked like it would allow entry of these special diacritics. Most common fonts include these IAST letters, so text copied into iOS displays correctly; but I've found no way to enter such text in iOS. Does anybody know if there is a way of typing the IAST diacritics in iOS?
iPad Air Wi-Fi, iOS 10.2.1