3k is a bit tight unless u do it yourself.
I was told 4.5k for labour to strip and put the engine back, then Add the cost for machining parts and parts itself.

U might be able to source a cheap h22a and put it in for around 4k give or take.

200 000km isn't a lot for Honda. I had my eg3 with 270000km no problems.

Where is the oil leak? Might only need to change the rocker cover gasket only?