How to use a plate extender?

I feel stupid for even asking after over a decade of doing non professional but advanced photography, but I've never been a gear person. I have my Canon 6D and its somewhat heavy 24-105mm f/4 lens and have pretty much always shot without a tripod, so when I moved countries I didn't bring the one that was gifted to me with me. Huge mistake, I hadn't realized how high quality it must have been because it supported this camera and lens combo with zero issues.

Now, trying to get a tripod I can afford has my camera tipping forward and is absolutely killing me. The cheapest solution seems to be a extender for my base plate to move the center of gravity backwards, but all the extension plates I see seem to have a type of tripod that they can just slot into rather than the kind of quick release plate I have. Can a basic extension plate be safely screwed on to that quick release plate and then have the camera screwed on to it or does it have to have the right kind of tripod?

I hope it's clear what I mean when I say extender plate, it's just the longer version of a base plate with usually a sliding screw in it. I'm sorry, every time I see one it doesn't really give me a clear name for what it is.

Thank you!

*also I know my best solution is to get a good tripod and pair it with a fancy lens holding plate (?), but unfortunately money is tight and so while I need a tripod for some of the work I'm doing, I can't really afford much more than what I have. I'm also not really asking for purchasing advice, just asking how these things work and if it's safe to use one with an existing quick release base plate~