Anything is possible, but would cause an extended startup and a Kodi restart, every time you open Kodi.
There is a lot of processing involved to download and merge 2 external data sources, as well as reformatting of the Providers EPG (formatted incorrectly), saving the file locally, then requiring a restart.
If you still have valid guide data upon startup, you do not have to go thru the process.
My guide is a 4 day guide, updated every 3 days.
Provider guide is usually 2 days.
IPTVXtra Help info;
Merge Alternate and Provider EPG data: Will combine both EPG data, using the Alternate as main, and Provider as secondary.
*Any channels missing from main, will be added from secondary, if present.
**Merged EPG files are stored locally, and therefore requires you to refresh it every couple of days, or if you notice missing EPG data.(Just open IPTVXtra2, select Update and All).
/Shooty