Looks like there is a PCA about a mile from Santa Ana.
You probably need to do a deep dive on "Why".
And trending up. Thus my question:
In any event, the PCA is probably more likely to support an Hispanic or multi-cultural church plant than are the two denominations mentioned by you. They have both a focus and more funding available. Although you'd probably need to bring something special to the table if you are expecting a quarter to half million dollar investment in an inexperienced guy. (Of course, if you are independently wealthy and are planning to self fund, the equations will change.)
Santa Ana is a very well-known Hispanic/Catholic dominated cultural center. It grows through either immigration from Mexico, or very wealthy young people, with jobs in Irvine, who want to live in an "up-and-coming urban area." The Diocese of Orange County has a massive presence in the city, purchasing the most influential church (Crystal Cathedral) back in the early 2010's. The mega-church influence is very large as well, with 10+ churches in the 2000+ member range, having very little understanding of the biblical gospel, and no confessional understanding.
There is a PCA church in the area, but it isn't well-known. Acts 29 is growing in presence, and KPCA is more well-known amongst Koreans (obviously). But as it relates to an inter-generational, multi-racial church that matches the demographics of the area, there isn't anything. The PCA church in Orange County is known as being "white-dominated." I'm not entirely sure why, but that's the understanding across the board.
I don't know of an effort to self-consciously reach across racial, economic, and demographic boundaries, and plant a church within Santa Ana that is confessionally grounded. I'm bilingual in English and Spanish, so the prayer is to have services in Spanish and in English, with the hope of interaction across linguistic lines.
Acts 29 is the most likely to fund a church plant, as it has a higher percentage of Spanish-speaking ministers than PCA, and a larger fund.
Orange County can be deceiving, with a decent presence of Reformed congregations, but, as I had said, there's nothing within Santa Ana, and it's remarkably close to Mexico in culture and exclusivity (if you're from Santa Ana, you work/live/pray/worship in Santa Ana). It's a bubble within Orange County. It's hard to describe.