Splitting DVI-I into DVI-D and VGA then using both - will it work?

Ok i've got a bit of a nerdy problem.
I've got 3 computers hooked up via a dual-head vga kvm switch. It needs to be vga as two of the computers are (very) old and even if it's possible to find dvi video cards for them, i don't want to fork out massive amounts on a dual dvi switch.
The problem is that the image from the switch is just slightly smudgey. It might even be the analog input of my lcd displays rather then the kvm, either way it's annoying if i'm writing a lot of text.
Now I spend about 90% of the time using one of the computers (the modern one) which is dvi equipped and the other 10% switching a lot between all three.
It's my understanding that DVI-I carries both digital and analog signals. There are also splitter cables that can give you VGA and DVI from a DVI-I input. However, will this work if i send DVI > monitor, VGA > KVM and switch between 1 pc and kvm modes (DVI and VGA) on the monitor?
My concern is that the automatic resolution detection thing (sorry don't know the technical term) will get confused as the KVM's display emulation will be giving different messages to the graphics card then the monitor will. Can most (or any) graphics cards handle this? Will it cause any damage if not? Anyone done this before?

Thanks for any insights..

I take it that your monitor has 1*DVI imput, and 1*VGA (and sorry if this is what you ment)

Plug your new computer directly into the monitor using its DVI imput.

Then use the KVM switch for the two old PC's, going into the monitors VGA imput.

Therefore you have DVI for new computer, and VGA switching between two old computers.

The monitor will scan for an imput, and probs pick up DVI first, but if there is no signel (PC off, standbye,or in powersave turn screen off thingy) it will go onto the VGA, switch, allowing you to use the old computers.

If you want them all on at once, your monitor should have an imput select function, and just use it to select the one you want.

Worked fine (for the short amount of time I had two pc's in my room) for me:D

Yeah i know that would work but i want to avoid it if possible as when i'm doing the 10% switchy switchy time (between all 3 computers) i don't want to have two different sets of buttons to play with. I can see myself repeatedly setting the monitor onto a computer without kvm focus then wondering why nothing works. Basically im a bit of a finger moron.

Nobody know the mysteries of DVI then?

DVI-I can only output either digital or analog signal at once. GPU has total 2 output signals. One per output, e.g. DVI+DVI or DVI+VGA.