fan training quince

In a fit of daft optimism and overenthusiasm last summer, I ordered a bare-rooted quince for fan training in the South-facing border of our new garden. I thought I'd done my research in choosing Vranja as the variety, since it's apparently trainable, and deciding on fan-training to avoid it getting too big. We'd got the frame up in advance, too. However, I clearly didn't read enough and was a bit surprised when it arrived. Now it's in, I can't reach the top even by jumping, it's showing no sign of wishing to branch at all, and I'm finding advice that I'd missed before that they are best bought a little older to avoid the difficult first few years. Can anyone suggest how to get out of this pickle? Do I go ahead? Or do I move it to the bottom of the garden and let it grow as a standard where there's room for it to let rip? There's a space in the NW corner where a cherryplum died suddenly last year: we'd been planning on having it removed, stump and all, then leaving it a while until safe to put in a plum (czar, on pixie rootstock, as there is already silverleaf in our Victoria plum on the other side of the garden). If I do that, has anyone a good suggestion for what to put in the space prepared for fan-training? We would like a plum, as the old Victoria is not long for this world and will be sorely missed when we do call it a day, but is it setting ourselves up for failure to plant it where it will need regular pruning and might got the same way? Or should I go safe with an apple (which we'd like, but seems a bit of a waste of a prime, south-facing location, given that we have a cooking one doing fine on North facing)? I bought two ballerina pears in the same fit of enthusiasm, so probably don't need any more of those. For what it's worth, we are on clay in Bucks and a wide variety of fruit trees seem to do well in the village. Thank you!