If it’s possible to have the people that gave you the footage to re-dig, I’d ask for that. We have Mpeg IMX decks here. I do all my stuff at 10 bit uncompressed (Graphics and other footage are in 10 bit). The back of our Mpeg IMX deck has SDI outs and ins, so though the footage is stored on tape with this format, it can behave like a D-Beta deck.
Good luck,
Bear
Hope all is well,
Bear Baker