How can i set my lockscreen to pattern after a time limit but use swipe till then?

I understand we can use the time out settings in security to delay pattern lock for say 10 mins. But i want the normal swipe lock for that 10 mins instead of having a phone without lock screen. and after 10 mins of non usage it can enable pattern lock as usual. Any help or leads would be so helpful!

TIll most stable rom

There should be a column or tab for most stable among nighties, stable for every mobile

Best Stock rom version Till date

hi friends,
i got my mi 4i with stock rom version 6.4.10.0 with lots of bug:confused: then i keep updating it now i m on 6.6.6.0
but now i am having bugs like call drop issue and faster drain of battery, camera also lags after 10-12 clicks.
now i want to downgrade so please suggest me a version which is kind bit of most stable among these.
Thank You.