As a diy'er who has had a few heads reworked I would suggest removing it and turning it over to a reputable machine shop that does head work. Try to find a tech that you will get that warm, fuzzy feeling with and turn it over to him. Keep in mind too that some of these types of shops (in rural areas anyway) are not on main street attached to an automobile shop. The last one that I had done the guy builds dragster engines so all the work came out great.
Anyway, while the head is off replace the chains/sprockets if needed. I would just go ahead with replacing the plastic guides/pieces that are used in the vicinity of the chain. Everything on the front of the engine that you open/expose/inspect should be a candidate for replacement if you see anything you don't like.
'97 Honda CRV