It sounds like your temps are good. I would never suggest trying a new prey or new form of a prey to a royal they tend to imprint and will not sway from that. I would suggest this. Turn off his light for 7 days, cover the front of the enclosure with a cloth also for 7 days, don't do anything but peek in during the day and see if spot cleaning is needed. If you use paper I might suggest a temporary switch to particle substrate so you can spot clean and not need to replace everything. Makes sure that he isn't going to shed. and if there is no shed sign after 7 days try this.
After sunset place a thawed rodent (what every you have been feeding) out beside the vents or door crack for at least 20 min. If your snake is not out interested toss that one and wait for a further 5 days. If he is make sure to heat the rodent (I use a hair dryer) up I personally measure the temp and make sure it is warm, 37ºC is normal excited rat body temps this is what I use. Then feed.
It is odd for a little one to refuse, since your temps are good, (what was the air temp?) it is likely the issue is stress, as many have guessed.
In the classes on animal care I did for work, they used a term that applies here, 'skillful neglect' sometimes the best thing you can do is to do nothing.
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