I'm looking for the same thing , and came across the same results as yours.
i have 13 miners running Tri-X's and it's such a pain , because not only they need the dummy to bootup, but also they require the monitor when the mining is getting started !!!
i talked to a guy who produces some modified hardware equipments for us , he told me that he can build up some for me , but not 13 that i need .
he needs an order of at least 50pcs ,  so basically if there is enough interest it's possible.
he asked for 15$ for each dummy .
if anyone has a better solution please speak up.