Beaded yarn for Sahara?

I purchased my yarn for Sahara last week. I ordered Handmaiden's Great Big Sea which is a worsted weight yarn with a lovely twist made of 50% silk, 30% merino and 20% seacell. It is a handdyed yarn in a shade called "Pumpkin."
I would like to have a beaded yarn for the neck, sleeve and hem bands like that shown on the pattern, but I'm not sure which is the best way to proceed with that. I found some lovely Japanese triangular shaped 5/0 seed beads which have an orange core and clear outer part. I think the color is subtle enough and the sparkle is just enought to add subtle glitz which is what I want. My question--Would it be better to string the beads on the yarn and place them at specific intervals--say one bead every two inches--or to place them at specific stitches in the pattern? Any opinions? Ultimately, I guess I will have to swatch the lace and experiment. I hope to start Sahara this week after I swatch the yarn for gauge. I need to finish a couple of chemo caps first then I'm in!