Is it a cool promotion? Absolutely.
Is it necessary? No. Not in any way, shape, or form.
During the regular season, this type of minor-league promotion wouldn't bother me in the least. In fact, I'd be inclined to praise the Royals for doing something like this to help bring people into the arena to see their games. But we're talking about a playoff game where the READING ROYALS are competing for the Kelly Cup. Running a promotion that helps draw attention to the NHL franchise isn't really appropriate at this time of the season.
Do I like the uniforms? Sure, they're nice. I like how the Royals' team name across the chest to the Capitals font. I assume the patch on the left shoulder is the Kelly Cup Playoffs patch, making the uniforms entirely unique in terms of when they were worn on the ice. But they did this in Round One against Greenville as well!
Go Florida and keep on winning, Jesse! I'll be cheering as you send the Royals and their Capitals-centric uniforms home with nothing to show for their efforts or uniforms!
Until next time, keep your sticks on the ice!