"Celt" Conjecture

[Conal]

The Celtic adaptation of the Iberian script denotes non-sibilant obstruents with moraic characters, i.e., each character contains an inherent vocalism; thus, there are five characters to denote, for example, /t/ plus each of the five vowels, respectively. Resonants, i.e., the vowels, nasals, liquids and glides, and the sibilant(s), are denoted by segmental characters. Such a system, of course, creates problems for the writing of groups of non-sibilant obstruents plus liquid, which are common in the Celtic languages; thus Ti?i? (MLH K.1.1 A6), which represents accusative /tri/ ‘three’, must make use of a ‘dead’ vowel which anticipates the quality of the following organic vowel. The occlusive characters, moreover, are not distinguished for voicing; thus, for example, the same character may represent /t/ or /d/, and hence is transcribed by neutral <T>.

May represent ... in this case, elating to Ceti, does it ... specifically?

As such, if on a Celtiberian inscription one finds CelTi, that theoretically can be read as kelti, gelti, keldi, geldi, maybe considering aspirates and fricatives also khelti, helti, heldi, helthi, etc. Only external evidence can help to reduce the number of possibilites, but nevertheless in many cases will still be a hypothetical reading (see the Flaccus example above).

What would you consider valid external evidence?