Sour cherry as a rootstock

There is a sour cherry tree that produces massive amounts of suckers.Can i use these suckers to graft onto the
sweet cherry we all love.How would i proceed in such an endeavour?
Do i graft in spring ,then wait for the graft to be succesfull,then  at the dormant season uprooting/disconnecting the tree from the mother tree and put it in a ''permanent location''?
Do i uproot/disconnect the sucker from the mother tree at the dormant season,then potting it up,then at spring grafting with the scion?Similar in how people buy apple rootstocks
and grafting them on their table.
Do i uproot/disconnect the sucker from the mother tree when its dormant,then putting in in its ''permanent location'' then grafting it at spring?
What would be ''best practice''?

Wait until the tree is in dormancy ...the suckers are a great root stock ..and believe it or not but stone fruits are very adaptable to another as rootstocks. especially cherry plum great for cherry and plums alike..anyways in the mean time i would suggest stool layering the suckers to get a stronger root system..pile up a bunch of loose soil or sawdust around the base of the sucker in a mound then in the early spring before the cherry buds out take you're preferred cherry cultivar scion and pull out you're layered suckers and graft them. And either plant them out immediately or pot them up. Unfortunately this is a very seasonal task but a little time is worth it.

Also i would suggest you plant garlic or another aromatic perennial herb beside you're grafts wherever you plant them ...this will prevent gurdeling and prevent you from having to bridge graft in the future.