Giant MPH/Hope C2 caliper piston removal

QuinTeknoLife

Retro Newbie
Hi guys, I'm in the process of replacing seals for a (left/front) brake of the MPH 'brand' (C2 clone, caliper is almost identical). I got the MC and lever both done but am struggling with the caliper pistons. After a ton of effort I got one as unscrewed as it can get, but am unable to completely take it out. I have already tried pumping in air with both a bicycle pump and our syringe while sealing off the hole in the caliper half but that archieved nothing.

The brake (obviopusly) is empty and disassembled, what is the easiest course to take (without having to buy or rent an air compressor)?
 
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