Assalam o Alaikum
cylinder weight is max 60, 65 kg. i don't think its gona effect the springs or compress them permanently. just put spacers and they work fine. don't know about the cost but they should not be very expensive. should be around 400-500 max.
i got spacers made of thick tire rubber in my daewoo but i don't think those are available anymore.
metallic spacers produce a thud if you pass over speed brakers at high speed, but the rubber ones don't do that.