That somebody was clueless... a fixed gear bike does not need track ends and many vintage road bikes came equipped as fixed gear models and had horizontal dropouts while many a coaster equipped bike came with track ends. In many cases the same model was also offered with an IGH and in some cases you may have been able to buy one with derailleur gears.

The Royce Union looks to be an early 70's model and is a basic straight gauge high ten frame with mostly steel parts and it would be interesting to know if it has Araya steel rims and perhaps, a Shimano rear d and shifters as Royce fitted theor bikes with japanese parts when domestic makers like Schwinn were still using the despicable cable breaking Huret Alvit.

Those wheels, if they say Araya, were designed for fairly light riders but are very well made... you can't say this about many 70's steel rims.

It is not a highly collectible bicycle and no kittens would be sacrificed if it was turned into a fixed gear... you would need a new wheelset and have to deal with the cottered crank but would leave the paint as is as it is in very nice shape.

The brakes should work really well but I'd lose the suicide levers... with two brakes you could run fg/ss.