What is this based on? I've had 2 checks in 19 years of working privately, including contracting for 15 of those, many of which were outside the UK. Nobody in the chain, not HR, hiring managers or recruiters are incentivized to examine a candidate deeply once they've been accepted for a role, and for contracting HR rarely even enters the picture.
In both cases where a check was carried out, it was for a company I could not recommend working for regardless of income. One of these resulted in the only time I have needed a solicitor to ensure timely payments. From this angle failing DBS sounds like it might be a blessing in disguise for OP