I pretty much got this idea from Xorban numerals. The schwas could be written with <'> or <.> <nm'p'd'tr> or <nm.p.d.tr> = "123".
In addition, specific common "ë + root" <'CC*> sequences could be replaced with symbols from ASCII or Unicode. So <nm'p'd'tr> could be written <nm123> or maybe <#123>.