Have always used Florida Slimcados which are either pure W.I. or a hybrid. Have worked out well. That's what I'd recommend.
Chopped off a Brogdon from a Waldin rootstock and used the watersprouts to successfully graft 6 scions of Ardith, Holiday, Sir Prize and Pinkerton. Here's a shot about 3 weeks ago. It's quite a bit bigger now and really sending off a flush of leaves even the lower branches.
Reed is finally producing well and is about 10' tall. It's holding last year's and this year's fruit set. About lost Sharwil, Gwen and Oro Negro to some kind of canker, blight, lab couldn't isolate it. Coming back with a treatment of Phyton 35.