Just be careful that your RA doesn't cause you to react so quickly that you endanger a non-transponding aircraft operating quite legally in Class G airspace!
As I wrote earlier, use of TA/RA in Class G airspace under VFR could be actually prove more hazardous than it is worth. The scenario you suggest (flight under VFR below MSA, RA received, climb into IMC, emergency climb above MSA perhaps with insufficient time to advise ATC......) could all be avoided if instead you left the system at TA only, queried the traffic and then spotted the Cessna 152 which has just selected its SSR to Mode C.
I strongly advise switching to TA only under VFR. You must learn to react instinctively to RAs; however, 'nuisance' RAs in uncontrolled Class G airspace could cause you, your passengers and other legitimate VFR traffic needless hassle.
Alternatively, consider staying out of such airspace?