Upgrading 90 credit diploma (Engineering)

Hello Guys,

I believe I finished an Engineering BTEC 90 Credit Diploma in 2018 at a college.

The certificate I was eventually given shows -

"BTEC Level 3 National Foundation Diploma ENGINEERING"
"Grade Merit"

My college was pretty terrible, lots of wasted time and lecturers were very unwilling to help. I am now looking to take another course to bump up my UCAS points with the intention of getting enough to meet the minimums for most military officer roles. I currently only have 54 UCAS points so need to get some more.

My main question for this thread is -

A) Is there a way I can perhaps upgrade my 90 credit into a full diploma (I assume this will just add onto my first result, E.G. A D in the full would result in my having an MD total result). This would also need to be done via a distance learning course.

B) Would it instead be possible to just do a BTEC Level 3 certificate in engineering? This seems like it would give me sufficient UCAS points, but would there be too much overlap with the 90 credit diploma? I have found a course already offered at Semester learning

Thanks for any advice in advance and if any clarification is required please let me know!!