Go for it.
Use a good compression splice or braze / silver solder a terminal on for the lead wire. If you braze or solder, make sure the metal is actually wetted by the filler material. So possibly an acid flux is required. I'd be weary of crushable aluminum splices over time.
Terminate at both ends if possible. I hate loose strands.
An Ohm Meter is your friend here. If you have a good DC connection you'll be fine.
With it being multi-stranded, that will help with the skin depth issues. Traditional ham antenna wire is copper flashed steel. The flashing is mainly for connecting, not conducting.
You could always use it as a carrier for copper, but I doubt you will need to do that.
HF is a bit dead/weak/ wierd these days due to peak solar cycle, so expect higher frequencies then usual to work better during the day, and go down band at night. Check your daily space weather and propogation forcasts before before blaming your antenna.
We're getting hammered by Solar Flares. I never expected to see an Aurora in North East Ohio, but we did.
Steve