They have MCC experience they are wondering if it's worth going down the path of trying to get a class 1 with an 'as or with co-pilot' restriction which would allow multi crew ops at least? I'm wondering if anyone has gone down a similar path in the past so that I can pass on some guidance.
There's no real aiming for 'with or as copilot'. You do the medical for the class you want, AvMed decides on any restrictions that may be required. As for gaining work with such a restriction in place without significant experience might be difficult. Pretty sure the restriction requires the other pilot to have no restrictions so as an FO it adds additional issues for operators to make sure you are not paired with a Captain with similar restrictions, there's a few out there.
I'd be trying to get a medical better than 'with or as copilot' or no restrictions first.