"Also, viking age ´w´ was not exactly like modern english
´w´, but rather closer to modern norse ´u´."

I totally agree with this. But it's hard to use the letter 'u' for
this sound in an english speaking context.

"Grammar will make a good king, but his brother Pronounciation is not
suitable for the throne."

Well, the dialect of Dalska has a grammar that is quiet similar to
the swedish (and of course norwegian) that you find in law texts and
other documents from the 14th and 15th centuries. Just taking an
example: this is how one counts from one to four in dalska (don't
care to much about the pronunciation - it's meant to be more of
morphological interest)

ienn kall (nom)
ienum kalle (dat)
ienn kall (acc)
- all meaning "one/an old man".

ie kulla (nom) - ['ie' is nasalized]
ienner kullu (dat)
iena kullu (acc)
- all meaning "one/a girl"

iett aus (nom)
ienu ause (dat)
iett aus (acc)
- all meaning "one/a house"

twer kaller (nom)
twemm kallum (dat)
tuo kalla (acc) - ['uo' is nasalized)
- all meaning "two old men"

twär kullur (nom)
twemm kullum (dat)
twär kullur (acc)
- all meaning "two girls"

tau aus (nom)
twemm ausum (dat)
tau aus (acc)
- all meaning "two houses"

trair kaller (nom)
trimm kallum (dat)
triuo kalla (acc) - ['iuo' is nasalized)
- all meaning "three old men"

triär kullur (nom)
trimm kullum (dat)
triär kullur (acc)
- all meaning "three girls"

tråy aus (nom)
trimm ausum (dat)
tråy aus (acc)
- all meaning "three houses"

fiuorer kaller (nom)
fiuorum kallum (dat)
fiuora kalla (acc) - ['iuo' is nasalized)
- all meaning "four old men"

fiuorer kullur (nom)
fiuorum kullum (dat)
fiuorer kullur (acc)
- all meaning "four girls"

fiuore aus (nom) - ['e' is nasalized]
fiuorum ausum (dat)
fiuore aus (nom) - ['e' is nasalized]
- all meaning "four houses"

This system is quiet far from that of standard Swedish and "standard"
Norwegian, and also quiet far from all other dialects of Scandinavian
spoken on the Scandinavian mainland. My own north Scandinavian
dialect has a much more simpler system (but we have instead dative
ending '-om' for the remainder of the numerals up to 12, like 'Je ha
hylpe tolvom.' - 'I have helped the twelve ones.')

So, Dalska is not just interesting because they have preserved the
difference between ON 'v' and 'f' (as in 'hafa'), they have so many
other nice features one can look at (examples: ON 'nátt' is still
pronunced with long vowel and long consonant in modern
Dalska: 'noott' ; ON 'gefa' is still pronunced with short vowel and
short consonant: 'dsävo').

/Arnie