Having messed around with Rover V8s for 22 years, I've done all the above. Fitting a crated Land Rover engine into an MGB, after changing the front cover and pulley, etc needed just that. Vaseline in the pump gears, but you can also feed oil down the out-pipe if you spin the rotors in reverse. The BV8 has a remote filter, which doesn't help either. Even using a drill to prime the pressure it took a long time.
On the matter of lubrication and filtration we had an industrial consultant of such matters in the MG Club at the time. From him you could get straight talking advice about the subtleties of 0w/30 vs 0w/40 vs 5w/30 zs 5w/40, because back in the day I was experimenting with my Roadster oils.
What he also talked about was that new oil filters don't filter as effectively as those with some mileage on them. This is the filtration vs flow rate conundrum, and I suppose there will be plenty about it on the internet. I wouldn't do an annual filter change for that reason.Since a filter can take 12,000 miles of hard use, my preferred method is when it seems the right time.
