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"which I used" is correct and can be used in written English.
It is typically used to provide additional information about a subject or action, and is often preceded by a comma and the word "which." Example: I baked a cake, which I used for my daughter's birthday party.
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Five Live, which I used to work for, do not, which staggers me.
Instead, it was an oscar, which I used to keep in a fish tank back home.
Including, at least in part, the Lincoln Center Festival, which I used to run.
Let me illustrate something mundane and everyday which I used to take as a given.
"Stephen Crane's In the Desert, which I used as the epigraph for Battleborn".
Hopes of a collapse, which I used to share, appear wishful thinking.
A moment to breathe, finally, which I used to demolish some more Shepherd's Pie.
I also had posted up pictures of the leading Nazis which I used for target practice with my air pistol.
I had to buy the latter variety, which I used to make applesauce, at a farmers' market.
Gone are the wonderful scales of the moon and the planets on which I used to weigh myself.
At some point I got over my anxiety about being a copycat, which I used to have intensely.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com