8 speed chain on 9 speed chainring and front and rear mechs?

[Blue Hills]

Apologies, probably been asked before but is a three in one question and may also help others.

I have an 8 speed set up on a self built tourer.

Front chainset is 22/32/42 (Alivio)I think only ever came in that format.

Am thinking of putting a 44T big ring on which I think will fit.
But it's 9 speed. Likely to be a problem?
If I do fit it, a scouring of shimano's techsheets seems to indicate that I will also have to fit new front and rear mechs to handle the increased capacity and the front's change from a 20 to 22 spread and a 12 rather than 10 jump from middle to big ring.
But these mechs are 9 speed.
Will the 8 speed chain run OK through these?
Sourcing of these bits no issue as I already have them.
The bike and cassette will remain as an 8 speed set up - I like it.
It's an 11 to 34 on the back. Won't be changing that either.

 

[Cycleops]

Should be okay but a nine speed chain is narrower than a eight speed.

 

[mcshroom]

Should be fine. I have 9sp Sora mechs and a Stronglight impact chainset which has 10 on rings on it. They work fine with the 8sp chain and cassette, except the front derailleur needs to be carefully set up to avoid the chain scraping the cage a bit at the extreme ends of the cassette.

 

[Yellow Saddle]

No prob.