You can try using a crochet hook in a slightly smaller size or you could try slipping 2 sts as if to purl, k2tog then pass the slipped stitches over.
It seems Ingrid had an easy way of doing a bunch of kXtog, but I can’t recall if it was like above or what. Perhaps she’ll chime in.
ETA: I just found my note from some website on P or K tog large amts:
[INDENT]"…PXtog/kXtog bobbles or nupps can be done more easily as psso’s and you’ll get a result identical to actually trying to knit or purl them together .
To purl X together: Slip X-1 stitches purlwise. P1. Pass the X-1 stitches over. Snug the yarn in case executing the stitch left slack in the work. (e.g., for p5tog, slip 4 sts purlwise, p1, pass the 4 sts over)
To knit X together: K1. Put this stitch back on the LH needle. Pass X minus 1 stitches over the knitted stitch, i.e., take the second stitch on the left needle and pass it from left to right over the knitted stitch, slipping it off the end of the needle. Repeat.
Return the finished stitch to the RH needle. Snug the yarn in case executing the stitch left slack in the work. (e.g., for k5tog: k1, return this stitch to the LH needle, pass 4 sts over, return the finished stitch to the RH needle)
This method produces a very neat, reliable bobble/nupp."[/INDENT]