The Christian theologian Emanuel Swedenborg (1688–1772) holds a compatible view. Here is his interpretation of the 144,000, from his book Apocalypse Revealed #348:
And I heard the number of those who were sealed, one hundred and forty-four thousand. (Revelation 7:4) This symbolizes all people who
acknowledge the Lord [Jesus Christ] as God of heaven and earth and are
governed by truths of doctrine springing from the goodness of love,
received from Him through the Word [the Bible].
These are symbolized by the number 144,000 from the twelve tribes of
Israel because the twelve tribes of Israel symbolize a church that
consists of people who possess goodness and truth from the Lord and
acknowledge Him as God of heaven and earth. The number 144,000 means
all such. For that number has the same symbolism as the number twelve,
since it is the product of twelve times twelve, which is then
multiplied by 1000; and any number multiplied by itself and then by
10, 100, or 1000, has the same symbolism as the original number. Thus
the number 144,000 has the same symbolism as 144, and this the same
symbolism as twelve, as 144 is the product of twelve times twelve.
Similarly, the product of the 12,000 sealed from each tribe times
twelve is 144,000.
The number twelve means, symbolically, all, and is predicated of
truths springing from goodness, because twelve is the product of three
times four, and the number three symbolizes everything connected with
truth, and the number four, everything connected with good. Thus the
number twelve here symbolizes everything connected with truth that
springs from the goodness of love.
You can read the full interpretation in Apocalypse Revealed #348 here.
Swedenborg's interpretation provides the basis for the understanding of the 144,000 among the various denominations of Swedenborgians.
Most Swedenborgians do not interpret Swedenborg's use of "church" here to refer to any specific denomination, including their own. Rather, they follow Swedenborg's cue and think of "the church" as "all people who acknowledge the Lord as God of heaven and earth and are governed by truths of doctrine springing from the goodness of love, received from Him through the Word." In other words, being part of "the church" is based not on denominational affiliation, but on belief in Jesus as God and on living according to divine truth and love as taught in the Bible.
So Swedenborgians—especially the more liberal ones—commonly accept all heartfelt and Bible-believing Christians everywhere as included symbolically in the 144,000.