tldr; you should never post someone else's work without their permission, even if the post includes your own work as well or it isn't EXPLICITLY against the rules. it's just rude and makes people not want to share their work with you/anyone else anymore. just ask for permission or don't use other people's stuff for clout. it's that simple.
Don't think you are allowed do that, not with someone else's blueprint upgrades or not.
i checked in the rules, it doesn't say anything about that, it clearly said something about not being able to reupload someone elses blueprint, i think it's fair enough to say that i took inspiration, worst case the admins can delete my post if they think it's inopportune.
Edit:
i realized you were the blueprint author, if you want me to delete the post i'll do that
kind of a gray area there. i can understand any arguments from both sides. I have always felt if a BP was modified and re shared it should include a mention and a link to the original BP. I recently ran into a similar issue, someone using my plugins to advertise their server on their website and i was never mentioned. still not sure how i feel about it.
the thing that matters here is the spirit of the rules and respecting fellow creators, like you would want to be respected. even if it's TECHNICALLY not EXPLICITLY mentioned in the rules, it feels bad to have someone take your work and re-share it without asking for your permission (especially if they are calling their version the 'better' version), and the add-ons don't make it less their work, it just makes it also partially yours, and the lack of consent/permission with the original creator means it's not a valid collaboration. therefore, it shouldn't be done, even if you can get away with it.
If its original version has been modified I don’t see a problem. Heck, the first bp I ever uploaded was an airship I made from other peoples bps put together.
just cuz you did it and didn't get in trouble doesn't mean it was ever okay to do. a lot of stuff slips through the cracks either because people don't check their pings, or didn't get pinged and others don't have time/interest in researching to see if a blueprint is as original as it claims or not.