I have a customer who wants an eggless, sugar free cake. I can find recipes for one or the other, but I can't find both. Would it work to use an eggless recipe and just substitute the baker's Splenda? But a lot of them call for sweetened condensed milk... and that's sugar! Any suggestions, or does anyone have a good recipe? HELP!!! I know there are a lot of specialty bakers out there that deal with these requests daily! 
Have you thought of trying a recipe from scratch and substituing sugar for Splenda and using an egg substitute like tofu or Ener-G?
I sometimes replace an egg with a banana. I don't know where I picked that up - but it seems to work. usually one small banana per egg or so. You can also use soy power and water or soy milk power and water for eggs. I don't have the exact measurements becausee I am not on my computer. I would try these and then replace the sugar with splenda.
If you want the exact measurements - I can pm them later!
I did a Google search and was able to find Vegan sites where they give you some ideas for replacing eggs. There were about eight suggestions or so. I don't remember the site (didn't write it down or save it), but it's out there.
I wound up going with the Ener-G, but in my scratch cake it made it dense, so if I ever tried it again I would use a little less than recommended and probably add in a bit more baking powder to help compensate.
Sorry if this isn't a great help to you, but it's the best I can offer. I only needed to do dairy and peanut free.
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