that was bad advice from the colourist.
i mean, how is that supposed to work?
remove the dissolves, but include no handles.
they probably should have asked you to put copies of the relevant shots at the end of the timeline with extensions to cover the dissolves.
but seeing as how resolve can deal with dissolves, i don't understand their request.
you should first talk to them about the issue.
however, my approach to make it as simple as possible would be to go through a COPY of your original FCP timelines,
option+shift drag the relevant shots up to a new track,
delete everything else.
now you have to specific shots isolated, and in place.
media mange, with handles.
make an XML of the new Media Managed sequence,
and you give the media managed files and XML to the colorist.
or as mentioned above maybe they will want to relevant shots place at the end of a timeline, WITH the handles,
then they can copy / paste the grades.
it wouldn't be a big job for someone who knows what they are doing.
nick