As Ronski just pointed out, a migration keeps you on the same port, therefore on the same cabinet.
If you are out of contract with your current ISP then following Ronski's plan should get you on the Huawei. Just wait till the new cabinet is live, order a new line which should be on the new cabinet, then cancel the original line.
Unfortunately I had 9 months left on my contract with my ISP and couldn't justify a 2nd line for 9 months. It meant I've had to jump through quite a few hoops to get round how OpenReach allocate FTTC ports. I'll find out this Friday if it worked and I get on the Huawei cabinet.
With there being no individual waiting list/ordering system for each cabinet, it's all guess work from a mix of experience, advice on here, and advice from OpenReach. The 2nd line route looks to be the best chance of getting on your new cabinet. You can also take out 1 month contacts with some ISP's as a bit of insurance that you don't get tied into a new contract if you get lumped with the ECI again.