With a BS in Architecture, you should definitely be able to find work as an architectural technologist and with work experience in project management and structural engineering, you could definitely work in the construction field will very little trouble.
Engineering is a field in demand and the UK is short of engineers (even if it's not a visa "shortage occupation", trust me, it is). Back when immigration rules were a bit easier, I came on a work permit because engineers are needed.
Just to give you a bit of background, I'm a Supplier Quality and Development Engineer, subject matter expert with Plastics , working with Plastics Suppliers within the medical device industry. I've got a BSc in Plastics Engineering (I kill oceans obviously) and MSc in Biomedical Engineering Design and Manufacturing and I'm a Chartered Mechanical Engineer, so this job suits my qualifications well. Also, I am a member of the Women's Engineering Society in the UK, so yes, we need more women in STEM and your job history and qualifications make you very well suited to work in the UK!
If you were looking for qualifications, I reckon you could be a Chartered Architectural Technologist very easily with your BS and job history.
https://ciat.org.uk/membership/qualifying-as-a-chartered-at.htmlMy husband is an Architectural Technologist and he's got an HND and is trying to put together his application for Chartership. He's qualifying under the professional route, with 20 years experience rather than the qualification route.
(And yes, our discussions in our house are really geeky
)
If you wanted to go Structural Engineering, you could get Chartered with the Institute of Structural Engineers too.
https://www.istructe.org/membership/types-of-membershipBoth qualifications for you should be straight forward, if you were looking for such a thing.
Good luck with the job hunting!