Sæll Arnljótr!

> Konrad, maybe I've missed it, but how do you treat nasalized

vowels in the system?

I have thus discussed only 6 sounds derived from Proto-Norse long or
short A. These are the non-nasals (except for Ö by U-mutation of
natural short A - a short nasal) and are being represented by the Ár-
rune. This character looks exactly like the first rune in the
alphabet you posted as a link. The 5th rune in your alphabet (er)
and its reverse image (with line to the right and up) are treated as
graphic variants of the full Ár-rune. All that matters is where the
dots are placed. One can write with or without the graphic variants
of the Ár-rune, which are of Swedish origin (see Rök stone, etc.).
The long nasals are represented by the Åss-rune. Draw a vertical
line. Then draw 2 short lines of equal length out to the right from
this line. The 1st of these should start 1/3 of the way down the
vertical line and the 2nd 2/3 of the way down, thus dividing the
vertical line into thirds. Placing a dot above the upper of these 2
lines creates the character for long nasal Æ, the I-mutation of long
nasal A (=Å). The undotted version = Å, as on the first inscriptions
in the 16-letter futhårk. These two characters will be used for all
instances of long nasal Å and its I-mutation, which are the result
of a loss of a following N (a nasal) in Proto-Norse (ironically, the
nasals were not actually written in Proto-Norse, but were there).
Examples of words to be spelled with the Å-rune are: Åss (pl. Æsir)
in all of its cases, Gås (pl gæs) in all of its cases, the verb Få
(in all persons and numbers). These words are from Proto-Norse masc.
Ansuz, fem. Gansuz, verb Fanhan. Notice the N after the A in all
cases. This N is all that matters. This rule is universal for Old
Norse. Thus we have now introduced 2 runes, together representing a
total of 8 sounds. These runes are Ár and Åss. More later.

Regards,
Konrad.