Okay, so, as another trans guy I reckon I could probably give a bit of helpful insight into your boyfriend's current situation, but bear in mind that I don't know him and we all experience our gender dysphoria differently. With this in mind, take the best bits of what I say and take the rest with a pinch of salt.
Gender dysphoria f***ing sucks, and it can be immensely debilitating. Logic and traditional comforting doesn't always work to help the feeling that your external presence in the world doesn't reflect who you are. However, you do need to look out for your feelings as well as his. You might be able to help him feel more whole, you might not. I can't answer that.
What I will say though is that the wait for him to get the effects he wants from testosterone may be Much more than a year away. Depending on the GIC he's registered with, how his mental and physical health is, whether they'll call extra specialists in etc, you're looking at more like 2 to 5 years. Even that's optimistic.
There are quicker ways of getting treatment privately and they aren't too expensive after the first year. Setting up with admin costs and whatnot would set him back around £900 but after that he's looking at a much more survivable £50 a month- easily covered by a part time job.
As for a name change, it can be done for free as long as he gets the legal jargon right, is 16+, and can get the document signed by two professional witnesses. I went through that process and it was accepted by the NHS, Passport office, and HMRC- so it's completely legally valid.
One thing's for sure though, you need to tell him. Yes, his needs are important, but so are yours. I can't imagine not seeing my boyfriend for a month, let alone 1 year+.
I hope what I've said is of any worth at all. I wish you guys good luck and I hope it all works out.