Right… Any chainrings with correct BCD/PCD will do. If they have pins and ramps that aid shifting it is a bonus, if they don’t, shifting will be that little bit slower.
Been there, done that. I’m not a racer type so not an issue for me.
Pre-pandemic time there was loads of various chainrings on ebay kicking around, now probably not so much.
Especially if you are treating your bike as a secondary and you are not fussed I would use Stronglight you bought. They are OK. Had decent millage from them.
Personally I would look for steel 2200/Claris grade (or corresponding FSA/Sram/Others) chainrings to have best possible millage for money.
And of course your 30T wont be BCD 130 as it will not physically cover such diameter. It would be probably 78BCD. The smallest 130 BCD chainring possible is 38T, 110 33T and so on…
If you can source 11 or 12 speed chainrings with correct BCD won’t make any difference. Going opposite way might do. From 7speed to 12 probably might experience some issues with shifting or chain jamming.
But in the areas of 9-11 speed no issues whatsoever.
Cheers!
I.