White rice when cooked is mezonot (not haadama because white rice when crushed and cooked lost the original form already), rice noodles should be no different since rice is the main intention /the majority (normally mezonot would always be the ikkar, but rice is not one of the 5 grains; so we fall back on the intention /proportion). I live in Asia, we eat cooked rice products all the time...
Hidabroot says that rice noodles (made from rice flour in cooked form) is mezonot, but rice paper is made by steaming rather than cooking so it is shehakol.
OU also says to bless mezonot over rice cooked and rice pasta
See also OU's guide that tomato rice soup can either be mezonot or rice depending on your intention as to which one is the ikkar.