I personally would look for alternate training providers. If they are not accredited or registered with any SETA you can’t be sure that the course content is up to standard. My advise, look else where.
It depends on the course and the necessity, but most of the time – NO.
If it is a credit-based course and the learner is to receive credits/be entered onto the National Learner Record Database (NLRD) then a provider who is not yet accredited cannot ensure this for the learner. If it is a “nice to have” course, then perhaps you can.
Accreditation, even with its gaps, is at least a standard that providers should reach.