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It's entirely up to you if you fix your blinds to the uPVC, as you might realise it's not a deal-breaker if you move house, as regards the warranty I would screw to the frames, using a single thread screw into a pilot hole. The uPVC in the frame is tougher than wood, so your screw only needs to penetrate the plastic 10mm at most, maybe screw at 450mm centres. Likely the best screw head to choose is pan-head as these don't split or bruise the brackets/body of the top of the blind. Worried that you "can afford it just...", maybe hold off a bit longer to save up for the cost? In the meantime keep patching-up.
Screwing into a uPVC window frame should not cause any actual harm, but if something else was to go wrong under warranty it could be used as an excuse not to pay out. Having said that if there is an issue with new windows it is usually the quality of the installation, so that should be picked up quite quickly if it is a problem. If you sold the house the buyers might not be impressed that their window frames had holes in them though.
Screwing into a uPVC window frame should not cause any actual harm.... If you sold the house the buyers might not be impressed that their window frames had holes in them though.
The buyers wouldn't see holes in the frames if (as many do) leave your blinds in situ, they are very unlikely to fit the next property. Some buyers are happy to find blinds/curtains in situ as it gives them immediate privacy when they move in.
