Other Buildings Related: Building boost with gem adjustement

New Boost idea using gems for building or training troops.
ex.1
Level 7 Elixir Collector -> Level 8
cost: 28000 Golds
Upgrade Time: 1 Day
Finish now: 260 Gems

1 Day = 24hrs = 1440 mins
1440 mins / 260 gems = 5.54 mins/gem

Can we boost the upgrade time by paying fewer gems instead of all 260 Gems??
example:
Finish Now: 260 Gems
Finish after 6 Hrs: 195 Gems
Finish after 12Hrs: 130 Gems
Finish after 18Hrs: 65Gems

Same goes with other upgrades or trainings.. boosting them using adjustable
gem payments.

I guess through this method players will be encourage to use the gems more often.

Hope you can find time to review this.

Thanks,
Gheecko