I don't know the brand, but used a 'chevy style' valve spring compressor that had a two-ended hook at one end, a slot that would fit around the spring, and a long lever arm.
Fitted the hook(pick which hook you like, big or small) into any port I could find, placed slot over the valve spring, and pulled the lever until I could get the keepers out, release slowly.
This would work if you stuffed rope into the spark plug hole, and rotated the crank to get that piston up against the valves. Manual transmission in 4th gear, and automatic with a breaker bar & socket on the crankshaft pulley, up against ground or the frame, either should stop rotation to keep the piston against the rope, and thus the valves.
There are spring compressors that have 'fingers' that will fit under the bottom, and atop the valve spring, which you compress by turning a knob. There are also compressors that have a lever with a couple 'loose arms' that you snag one end of the lever, and put the 'arms' on the spring, and then pull down on the lever. The snag part is the intriguing part as you don't want that thing flying loose... it will hurt.
tom