One of my kit cars has a dreadful habit of getting its clutch stuck on. Over the winter. I used to prop the clutch open by wedging a bit of wood against the clutch pedal. but I stopped doing it as I didn't think it would do the mechanism much good.If doing a clutch on a driveway or without a lift, it's much easier to just pull the engine out unless you need to take the gearbox or transfer box out for another reason too.
I've made up a little bracket for my gearbox jack that bolts to the underside of the R380 where the three threaded holes are.
Means I can move the gearbox and transfer box about under the Defender or Discovery with it being kept left and not wobbling around.
As it is so light, the conventional and not -so conventional methods just don't work. So I have got practised at taking the engine and gearbox out by dropping them together on the floor then lifting the chassis-body up and sliding them out. The hardest part is separating the twin carbs/inlet manif/exhaust manif off the engine. Very fiddly. Engine bay is very tight.
The gearbox won't come off from underneath as once you tip the engine back/down it hits the bulkhead before you can remove the box. Otherwise it'd be a piece of pistachio