Software to Filter de novo INDELs

Question

[QVINTVS_FABIVS_MAXIMVS]

I have VCFs called in trios from GATK haplotype caller. I'm looking for a software tool similar to forestDNM, which takes VCFs as input and determines if putative de novo INDEL calls are true positives (or not).

The caveat is that I do not have access to the BAM files anymore, so the tool should operate only on the VCF file.

Do people have any suggestions or tips on producing a high quality callset of de novo INDELs without querying the BAM file?

Thanks