In short - yes it will clog fine needles. I recumbent that that you pour it into liquified butter - stir , let it set for a few minutes ...or as long as you can, then pour thru a strainer ( fine wire).
Alternatively - you can make a compound butter it WOW and room temp butter, and freeze or refrigerate back to solid form. Then - slice up as needed, and put pats of the herbed/compound butter in-between the chicken skin and flesh - particularly on the breasts and anywhere else you can. Seems to work about as well as injecting for me.