Easiest way is probably to rig the new calipers higher than the levers, undo the bolt from the old, whack the hose in the new and then attach bleed cup or syringe andpush enough fluid from the lever to either fill or bleed any air out depending on whether the new caliper is pre bled. I'd then fit them and push a little fluid back to the levers or burp them. That's assuming mineral oil that looks good on the bits coming out, if it's grubby or DOT then might as well do a full bleed whilst you're fucking about.
Easiest way is probably to rig the new calipers higher than the levers, undo the bolt from the old, whack the hose in the new and then attach bleed cup or syringe andpush enough fluid from the lever to either fill or bleed any air out depending on whether the new caliper is pre bled. I'd then fit them and push a little fluid back to the levers or burp them. That's assuming mineral oil that looks good on the bits coming out, if it's grubby or DOT then might as well do a full bleed whilst you're fucking about.