IANAL also, but since Apache is considered compatible with GPL3 and AGPL3, I think they have the ability to, since they can simply relicense their parts of it,

IANAL also, but since Apache is considered compatible with GPL3 and AGPL3, I think they have the ability to, since they can simply relicense their parts of it, and the resulting work is de facto AGPL3 taken as a whole. They might have to drop a 'portions are licensed under the Apache...' blurb somewhere, but the overall idea should be OK.