Yes it is safe. Up till about 1973 there were no IOLs and the eyes were left without a lens at all called aphakia. A IOL is not going to help if your retina is not put back in place. How well you see will depend much more on the retina recovery than anything else. Remember you are at high risk of RD in your fellow eye so have it checked often and avoid injury and diseases from unhealthy lifestyle (such as smoking and obesity)
Similar to you I had retinal surgery in one eye, which subsequently developed a bothersome cataract over the following nine months which was removed and replaced with an IOL. I only had a gas bubble however and never had silicon oil. My other, non-operative eye had a retinal tear which was successfully laser treated in my ophthalmologists (retinal specialist) office, discovered during my first visit there. It too has some floaters (not particularly bad) and macular pucker just like my operative eye had, as well as a baby cataract. My intent is to do nothing unless symptoms develop which impair my vision in that eye significantly, and my ophthalmologist supports that approach. I am seen by him every six months so if things stay like they are I may never need to do anything more. I seemed to be an outlier by not opting for cataract surgery in my non-operative eye along with my other eye, but I have had good success so far by using contacts for distance correction with a stellar 20/15 achieved by my optometrist in both eyes by so doing.