With a little bit of ingenuity and a diode bridge rectifier, you can use a MOSFET to serve in lieu of an SCR or TRIAC. Connect the n-channel MOSFET drain to the positive terminal of the bridge rectifier, connect the source to negative terminal. Connect the AC bridge input in series with your load and power line feed.
Drive the MOSFET between source and gate with an isolated circuit that provides square pulses synchronized to the line voltage zero-crossings. It is important to drive the gate hard enough to force the MOSFET into its minimum Rds(on) condition to minimize self-heating. Connect the bridge rectifier, with MOSFET attached, in series with the AC line and the load. Vary the zero-crossing synchronized pulse-width to control conduction angle in each half of the power line sinusoidal wave form. Or purchase a hundred, possibly correct, replacement parts from China for a few bux.