How to keep STI shifters working on bike with little use?

Titiritero

Retro Guru
I have a bike I want to retire to "decoration" purposes in the apartment. Still, I would like to be able to use it if needed (ie. guest bike, etc).

However, we all know STI shifters tend to gum up if not used for a while. Any tips to keep them in working order? Should I rather switch to thumbies? I know you can revive old shifters by spraying loads of WD40 on the mechanism, but I'd rather have a more reliable solution. Any tips are welcome!
 
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