Should work alright. Seal the top with tin foil and put it on a cookie sheet on a higher shelf. I used the little oven with glass doors so could watch the little decarb bubbles and turn off the oven when they were slowed down to a few. Then left it in the oven until cool enough to handle.
I have a multimeter with a temperature probe in there and that little oven holds it's temp really well.
Something that works well and is cheap is one of those little electric coffee mug warmers. They get hot enough to decarb oil as I've used one for small batches many times. Every time I see one at a thrift store I'll buy it so have 3 or 4 of them now. No more than $5 and would be worth buying new somewhere. I have one going from as soon as I get up until I go to bed so my bottomless cup of coffee is always hot.
You could add some of your carrier oil to the jar and as it warms on the hotplate mix it up good then just let it heat up until it starts making lots of tiny bubbles as the decarb starts. As the action slows down stir it a bit until there's just a few bubbles forming then switch it off and let cool a bit. You might need a cover to keep heat in so a 500ml mason jar will let you see enough to know when the bubbles are starting. I use a laser thermometer to monitor the temp but you can take it off the heat or just set it on the edge a bit so it's not in full contact with the heating surface.
I have a similar but much shorter jar with some live resin and I'm pretty sure the glass is borosilicate, (Pyrex), but it pays to be cautious so I wouldn't pre-heat the hotplate.
Or the oven. Put in the oven cold and once it hits 250F give it up to 45 min to get it decarbed. I do like to be able to watch what's going on so the timing is just right. Getting a diploma in chemistry spoiled me for, Good enuf! lol
