Surely it would be more pointless to have it sat unused?
I’m pretty sure that the OP is fully aware that the resulting separate items would still weigh the same as they do now, but the OP clearly likes what he has otherwise he wouldn’t own it. Yes the head will still be heavy but comparing 12-14kg for the removed head to the 45kg plus that the combo currently weighs is hardly pointless (and no this isn’t an Old School vs Class D argument). The speakers being old is a valid point, that’s why most who do this keep the head and dispose of the old speakers and combo casing.
With regard to comparing chopping this down to butchering an old Fender, I’m pretty sure if these old combos were going to become hugely valuable or collectable the market would have started to show signs of that long before now.