The number of bitcoins issued is halved roughly every four years.
In the future this number of releases will be small.
Why not consider a fixed low interest rate mechanism to ensure that Bitcoin is more suitable for current economic activity?
For example, if you hold 1 bitcoin in an address, you will be rewarded 0.02 bitcoin after holding it for 1 year.
Interest is calculated and paid every year or before you will pay to another address.
Why would you want to fight deflation? To prevent price from increasing so quickly that it keeps it from becoming a better medium of exchange? If the purpose is to prevent price from increasing so quickly,, it will most likely not work because supply would decrease and demand increase when lots of people hold that way to earn rewards.
Besides, things are not that simple. Such payment will only be meaningful if the saved bitcoins are put into good use or are useful for the network to keep it profitable/valuable otherwise a worthless network will pay worthless rewards.
In reality such fixed payment or rewards would be non-guaranteed and can only be based on how profitable your company's or organization's is otherwise you get paid worthless interest.
The deflationary model remains the best option for long-term holders who wish to earn valuable rewards that are non-guaranteed. It could encourage people to work harder to increase demand and sustain a price increase. The guaranteed reward like you suggested can be very deceptive and unsustainable