The best replacement for gluconate is ferrous sulfate.

The best alternatives to gluconate are rated as following:
★★★★★  ferrous sulfate
★★★★★  calcium chloride
★★★★  sulfate
★★★★  potassium chloride
★★★  citrate
★★  zinc sulfate
★★  zinc picolinate
★★  chloride
★  picolinate
★  glycinate
★  ferrous fumarate
★  magnesium oxide
★  zinc citrate
★  fumarate
★  potassium
★  potassium citrate
★  digluconate
★  oxide
★  chelate
★  monohydrate
★  aspartate
★  gluconic acid
★  calcium carbonate
★  ferrous sulphate
★  zinc chelate
★  carbonate
  zinc oxide
  chlorhexidine diacetate
  iron sulfate
  calcium citrate
  magnesium citrate
  magnesium glycinate
  zinc aspartate
  acetate
  diacetate
  just potassium
  zinc acetate
  cee

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Speaking about gluconate, one probably shouldn't forget about magnesium sulfate.

Other search terms related to gluconate and their ratings are:
★★★★★ magnesium sulfate
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gluconate
ferrous sulfate
calcium chloride