Ok... looking at your pic.... I expect that the "correct" way to light it is to mash the black button, while repeatedly operating the red button until it lights. In other words, the black button is the thermocouple bypass, which you must hold in until the thing heats up enough to keep the pilot gas flowing.
IF I'm on track with the above, then yes, you can light it manually if you have LONG arms
or a helper. One of y'all mash the black button while the other lights the pilot, then hold the black button until it can hold the flame.
Those igniters are universal. You can use one from a bbq grill, if you are handy enough to adapt as needed. So long as you have a ground between the button and the sparker, and can get the sparker near enough the pilot gas flow to light it, you're in good shape