Thanks everyone for the input so far, I appreciate it.
For clarification, I have worked more than a hundred hours every week for the past five weeks, building a business that offers a product that is new to my target industry. So far it has been exclusively funded by me (trying to avoid minority shareholders), so money is extremely tight, and I'm not getting enough time at the moment for sleep to justify booking a hotel out of income that can be better applied elsewhere in moving my business forwards.
It also means I am doing the work of two to three people to keep costs down in the start up stage. I understand the instinct to assume that time management might be an issue, however, building a non-gym-based business doesn't leave me with time or access to proper training. I am also, due to the nature of my job, often away from ready access to regular, consistent food. Once I am in a new location, it makes very little sense to leave until the job is done, which can take up to a week (even saving money on fuel at this point is a big deal).
I could easily work less hard, or get a job working for someone else 'if i really loved training that much'. To give you an idea, I hadn't missed a training session, 4x/week, for more than two years (until just over a month ago), and went from 149lbs up to 185lbs, with visible abs. With an eye on my future though, I'm really looking for damage limitation at this point, rather than any kind of gains.
The smoothie bomb you suggested sounds like a good idea in theory, but relies on access to equipment that I won't be around on a regular basis. I'm glad to hear you think bands an bodyweight stuff might be an acceptable short term substitute.