I have the Maiden England-2lp and it sounds pretty good eventhough it is picture vinyl.
I would like to own ARLO, ARDO and also Live At Donington, but not sure why they still haven't happened as there would be people interested in buying brand new, pristine pressings.
I missed the original releases, and I also refuse to pay overprice for the used copies especially because Live At Donington has fragile cover.
I think it was mentioned somewhere, might have been on the Iron Maiden Fan Club Forums years ago:
Someone mentioned that when Iron Maiden changed over to Parlophone in 2012, then they had possibility to re-release the back-catalogue on the new label. But, it might have been that the rights for the 3 live-albums were somehow left to EMI (or whatever it is nowadays) so that's the reason why they still haven't been able to re-release them. Or if they have the rights now maybe it will happen and I hope to see those being released but also hope to see some other live recording or boxsets being released someday as Harris must have all the possible recordings in his vault.