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second circulator on L8148E?

I have a Peerless conventional hot water boiler, attached to what was originally a gravity system. There are two branches, one for the front of the house, the other for the back. The cast iron radiator in the back bedroom was replaced with a Myson T6 panel. The 1 1/4 iron pipe that fed it was dissassembled, and necked down to 3/4 copper. It runs about five feet, and then tees. One tee, in 3/4, feeds a radiator in the basement, right under the supply. The other is 1/2 copper, and runs ~10 feet along the wall before going to the Myson upstairs. The Myson does not get hot in normal operation. (It did yesterday, when the boiler ran for four hours after being drained to replace the expansion tank, which started leaking on Christmas. TRV on it even cut it off, on the highest setting. So it works if it gets hot water.) The cast iron radiator in the basement does get hot.
I think this means we need to add a small circulator for the panel rad. Where the iron pipe transitions to copper would be the easiest spot. The question is, can I do that? The boiler has a Honeywell L8148E. I am not sure of the subtype, one that runs a motorized damper. There's a Bell & Gosset NRF-22 at the boiler (pumping through the boiler, sigh). Can I drive a relay, located at the pump, from the L8148 using a low voltage signal? It's about 30 feet, as the pipes run.
I think this means we need to add a small circulator for the panel rad. Where the iron pipe transitions to copper would be the easiest spot. The question is, can I do that? The boiler has a Honeywell L8148E. I am not sure of the subtype, one that runs a motorized damper. There's a Bell & Gosset NRF-22 at the boiler (pumping through the boiler, sigh). Can I drive a relay, located at the pump, from the L8148 using a low voltage signal? It's about 30 feet, as the pipes run.
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Comments
That said, is there any good reason why you can't wire the small circulator in parallel with the boiler pump? No need for a relay, if they aren't going to be controlled separately.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
If I can use a low voltage controller, I can run the wires along the pipe. If I hook it up using the aquastat's pump output, I have to run conduit. (I have to run some anyway, but much less). I also wasn't sure if I could do that, but I see the L8148E can run 7.7 A circulators, which is much less than my two pumps will draw.