I was in a situation not too long ago while traveling being in a town that apparently had no reformed church so went to a family member's church that was broadly evangelical, Baptist, fundamental.
We had good fellowship, gave there, and would likely go back in the same situation, not given a biblical reformed alternative.
It's was interesting, in the ordinary course of introductions and conversation, they became aware of my denomination and a couple of our distinctives, and we had good discussion. The second time they recognized us and we were warmly greeted, even introduced as "Presbyterians."
Knowing what I now know, I would first seek a biblical reformed church before an alternative.
Not only for the order of worship, but to support and encourage them.
Time is too precious a commodity in God's Kingdom to waste, it is too important.
Granted, we can't know everything about a remote church and we are at the providence of circumstance.
But spend the time, do due diligence among the NAPARC (North American Presbyterian and Reformed Council) denominations and research:
These are not all the biblical reformed denominations, only a list of many of them- and any church in them very generally, would be biblical and reformed.
Perhaps you will get some other links here for other biblical reformed churches not in NAPARC as well.
But, I would try to get them started out right, pray for them, and trust God to lead them providentially right into a solid foundation.
If there is none, this denomination holds the gospel, and has many fine attributes.
Post Tenebras Lux; "And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away." - Revelation 21:4