Litesire, Guldenshares buys up coins from the market also for its shareholders.

Aye.
And in the case the mining part should prove more yielding than it's buy-support part, and daily assets shifted to obtain the best value for it's holders, the buy-support part will remain. A bit less perhaps, but non the less, will continue to do so

Will the mining part shift more to mining Gulden after the btc halving this year depending if there is a doubling in btc price or halving of mining power.