I don't like the glue-on appliques on knits or jersey so I usually sew them on - you could iron the applique onto a patch slightly larger than the applique then hand stitch the patch, like Kwaaked suggests ( it's what I'd do too) Look forward to seeing the finished article complete with bling - will it have lights too??
Extra advantage - you can remove the patch after Christmas without damaging the sweater.
If you want extra zing then I'd suggest you buy some sew-on stones - knitwear really doesn't hold well onto glue.