Personally, I like your idea of using the voile to make narrow bias tape to enclose the seam allowances, both at the armscye and the cuff. I love the look of voile sleeves with no lining, when the rest of the bodice is lined. It’s truly a beautiful way to make up a garment. I honestly don’t think you will reduce the bulk by much at all by lining the sleeve, maybe a tiny bit at the cuff, but then you still need to finish your armsceye seam, which if lined, now has an additional layer of fabric. How did you plan to finish the armsceye with the lined sleeve? Were you still going to use the bias strip, tiny french seams (do able but challenging) or were you going to use the lining to cover over the seam?
I guess the other option would be to use a french seam on the cuff/sleeve seam. You will then need to stitch that french seam down, allowing you to take up that extra space between the cuff ends. In fact, that space I would probably roll and hand stitch to get it exactly right. Just some more thoughts……
I look forward to seeing your beautiful creation. I bet your children will look picture perfect!
Enjoy,
Carol