I have been cought before without a syringe and used a perfume mister pump. Careful not to get it on your pain though it'll stuff your finish.
I personally would bleed the system if it's all together to get the excess out.
WHATEVER you do Don't contaminate your brake fluid.

Don't re-use syringes
as far as the masking tape goes. I have done it before, but I would not say it's a good approach, and nowhere near as good as cleaning the brakes etc. before assembly.
makes the first few brakes scary (no real friction)