Formatting output from lincom with estout

[Mike Murphy]

Following on from a previous post I would like to incorporate the output from using lincom into exported results using esttout. Using estadd gets me most of the way there, but I end up with two separate rows for the coefficient & standard error- similarly, I can add the p-value as an additional scalar using ttail, but what I really want is for it to format as one row with parenthesis & sig. stars similar to the other output. Is there a way to achieve this within estout?

Currently, output looks like:

sysuse auto, clear

gen goodmpg = 0
replace goodmpg = 1        if mpg > 25

gen interact = goodmpg * foreign

reg price goodmpg foreign interact
est store reg1
lincom goodmpg + foreign
estadd scalar coeff = `r(estimate)'
estadd scalar serr = `r(se)'

. esttab reg1, stats(coeff serr) drop(_cons)

----------------------------
                      (1)   
                    price   
----------------------------
goodmpg           -1786.8   
                  (-1.54)   

foreign            1056.5   
                   (1.24)   

interact          -1308.2   
                  (-0.75)   
----------------------------
coeff              -730.3   
serr               1556.8   
----------------------------
t statistics in parentheses
* p<0.05, ** p<0.01, *** p<0.001

I would like it to look like:

----------------------------
                      (1)   
                    price   
----------------------------
goodmpg           -1786.8   
                  (-1.54)   

foreign            1056.5   
                   (1.24)   

interact          -1308.2   
                  (-0.75)   
----------------------------
label              -730.3   
                  (1556.8)  
----------------------------
t statistics in parentheses
* p<0.05, ** p<0.01, *** p<0.001