Disclaimer

Please note that these modes were not devised by Tolkien (let alone the Eldar! ☺), nor by any committees or groups representing Tolkien or neographies fans, whether those speaking these languages or others. Thus they aren't official or endorsed in any way but represent only the musings of one language, phone*ics, Tolkien and neography buff.¹ In fact I can't speak or write most of these languages, but have made use of theoretical knowledge gathered from reading about them. In fact those studying language (as opposed to languages), whether professionals or aficionados seldom can communicate in the languages they study, and they don't need to any more than a veterinarian needs to run like a horse. Still a native speaker has a sense for the fine details which a theoretical student necessary lacks, and any intelligent person can make a point which another equally intelligent person misses entirely. Thus, if you don't like them don't complain but improve them or compete with them as you please!
In fact they are very much open to improvement on wy own part, so please feel free drop me a line if you have any constructive ideas, suggestions or questions.

In response to those frowning on experimenting with theTengwar, allow me to quote Tolkien himself:

This script [the Tengwar] was not in origin an ‘alphabet’, that is, a haphazard series of letters, each with an independent value of its own, recited in a traditional order that has no reference either to their shapes or to their functions.6 It was, rather, a system of consonantal signs, of similar shapes and style, which could be adapted at choice or convenience to represent the consonants of languages observed (or devised) by the Eldar. None of the letters had in itself a fixed value; but certain relations between them were gradually recognized.

(Appendix E)

At any rate your command of Elvish script (not Runes) is quite good enough to read. But there are, of course, no rules for the application to English, so it is impossible to make mistakes, unless according to your own system…

(Letters 168, which shows that Tolkien wasn’t averse to others using the Tengwar or devising their own modes for languages observed (or, presumably, devised ☺) by them.)