The current GasGas models may still come with all the street hardware but unless your MTO office (DMV for the US guys) have them on the OK list for BC you will be out of luck with the exception of 20+ yr old bikes such as the one shown that where prevously allowed.
My 2008 250 came with /DRL/hi/lo beam, switches for turn signals and headlight, horn, speedo computer (same as the enduro model), tail/brake lights and switches. Basically everything you would need except turnsignals, but the switch is there for that too. No chance to street plate it in Ontario though, as shortly after I street plated my 300EC they pulled the plug on allowing such things to happen due to non conforming vin# and NIVIS which states its an offroad only model. Luckily they are still allowing the previously plated bikes to remain plated.
What trials trails are you speaking of ? A bud is moving to BC as I type and I'm sure he will be interested.