If your just making the switch I would recommend aginst spliced eyes on your hitch cord. Bulk hitch cord is cheap! Buy 3 or 4 types for the price you would spend on one eye to eye spliced one, and experiment. You can see what cord works best for you, what lenght, and what friction hitch. Once you have it down then spend the bucks (still not much) for the splices. What I've been known to do is make a purchase and spend a few extra bucks and get a chunk of hitch cord to play with. Even if you don't like it, you will find a use for it. Use it for a laynard, small sling, for zip lines, hitch for rigging or an ajustable friction saver.
I have found that double fisherman (scaffold) knots only become an issue for me on a hitch climber or a prusik minding pully with more than one eye. The knots can be bulky if using a scaffold to tie in with and scaffolds on your hitch.
The most messing around that I've had to contend with is using the hitch climber with a vt while using a triple scaffold to tie in with. The scaffold knot would foul up on my VT and the friction hitch wouldn't set. Now I'm climbing on spliced tachyon, hitch climber, VT, and use Ice Tail for my friction cord. I'm loving the setup even though it can be a little "slick" at times.
Hope I could be of some help